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2014/10/15 ¤U¤È 10:12:15
iphone Programming Glossary: objcHow to add a UIImage in MailComposer Sheet of MFMailComposeViewController http://stackoverflow.com/questions/1527351/how-to-add-a-uiimage-in-mailcomposer-sheet-of-mfmailcomposeviewcontroller a base64 encoder into your project. There are several out there mostly C though but the simplest ObjC one I found was called NSData Base64 by Matt Gallagher I took the out of the name after copying it in..
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library app's target then build settings then search for Other Linker Flags click the button and add ' ObjC'. ' all_load' and ' force_load' are no longer needed. Details I found some answers on various forums.. in the category. And their solution To resolve this issue the static library should pass the ObjC option to the linker. This flag causes the linker to load every object file in the library that defines.. I link all the Objective C classes in a static library Set the Other Linker Flags build setting to ObjC. and flags descriptions all_load Loads all members of static archive libraries. ObjC Loads all members..
What does the -all_load linker flag do? http://stackoverflow.com/questions/2906147/what-does-the-all-load-linker-flag-do qa1490.html IMPORTANT For 64 bit and iPhone OS applications there is a linker bug that prevents ObjC from loading objects files from static libraries that contain only categories and no classes. The workaround..
Having trouble adding objects to NSMutableArray in Objective C http://stackoverflow.com/questions/851926/having-trouble-adding-objects-to-nsmutablearray-in-objective-c appear in viewedCardsArray . Looking through SO I know these basic questions are pretty common to ObjC newbies like me so apologies in advance objective c iphone cocoa cocoa touch share improve this question..
To ARC or not to ARC? What are the pros and cons? http://stackoverflow.com/questions/8760431/to-arc-or-not-to-arc-what-are-the-pros-and-cons inline functions etc. OK now I will tell you about the small downsides If you're a long time ObjC developer you will twitch for about a week when you see ARC code. You will very quickly get over this... like C arrays of id can take a little more thinking about to do correctly. Fancy handling of ObjC varargs can also cause trouble. Most things involving math on an ObjC pointer is trickier. You shouldn't.. correctly. Fancy handling of ObjC varargs can also cause trouble. Most things involving math on an ObjC pointer is trickier. You shouldn't have much of this in any case. You cannot put an id in a struct ...
Objective-C - When to use 'self' http://stackoverflow.com/questions/2385980/objective-c-when-to-use-self If I remove the self keyword from the first example the program crashes with the message objc 1296 FREED id message view sent to freed object 0x3b122d0 If I add the self keyword to the second example..
Subclass UIButton to add a property http://stackoverflow.com/questions/5500327/subclass-uibutton-to-add-a-property nonatomic retain NSObject property @end UIButton Property.m #import UIButton Property.h #import objc runtime.h @implementation UIButton Property static char UIB_PROPERTY_KEY @dynamic property void setProperty.. Property static char UIB_PROPERTY_KEY @dynamic property void setProperty NSObject property objc_setAssociatedObject self UIB_PROPERTY_KEY property OBJC_ASSOCIATION_RETAIN_NONATOMIC NSObject property.. self UIB_PROPERTY_KEY property OBJC_ASSOCIATION_RETAIN_NONATOMIC NSObject property return NSObject objc_getAssociatedObject self UIB_PROPERTY_KEY @end Example usage #import UIButton Property.h ... UIButton..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers example with the UIImagePickerController. I wish the videos were available Ok so... I'm afraid my objc fu is not so strong. I'm also a bit confused by the final line in the above quote. I've been doing my..
iOS 5 Best Practice (Release/retain?) http://stackoverflow.com/questions/6308425/ios-5-best-practice-release-retain Apple says about opting out of ARC for specific files When you migrate a project to use ARC the fobjc arc compiler flag is set as the default for all Objective C source files. You can disable ARC for a.. default for all Objective C source files. You can disable ARC for a specific class using the fno objc arc compiler flag for that class. In Xcode in the target Build Phases tab open the Compile Sources group.. to reveal the source file list. Double click the file for which you want to set the flag enter fno objc arc in the pop up panel then click Done. See the full transition guide here . share improve this answer..
Undefined symbols for architecture i386: _OBJC_CLASS_$_SKPSMTPMessage", referenced from: error http://stackoverflow.com/questions/6984368/undefined-symbols-for-architecture-i386-objc-class-skpsmtpmessage-refere this error Undefined symbols for architecture i386 _OBJC_CLASS_ _SKPSMTPMessage referenced from objc class ref in ConfirmController.o _kSKPSMTPPartContentTransferEncodingKey referenced from ConfirmController..
To ARC or not to ARC? What are the pros and cons? http://stackoverflow.com/questions/8760431/to-arc-or-not-to-arc-what-are-the-pros-and-cons a significant number of ObjC exceptions you're using them incorrectly. This is fixable using fobjc arc exceptions but it incurs the penalties discussed below ARC will not leak memory during ObjC or C.. avoid it provided you can handle the OS version restrictions . For non ARC code you can pass fno objc arc on a file by file basis. Xcode unfortunately makes this much harder than it should be to do in practice...
How to add a UIImage in MailComposer Sheet of MFMailComposeViewController http://stackoverflow.com/questions/1527351/how-to-add-a-uiimage-in-mailcomposer-sheet-of-mfmailcomposeviewcontroller out. In order to get an image into your email you need to get a base64 encoder into your project. There are several out there mostly C though but the simplest ObjC one I found was called NSData Base64 by Matt Gallagher I took the out of the name after copying it in because it gave me problems . Copy the .h and .m files into..
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library and click the project in the Project Navigator click your app's target then build settings then search for Other Linker Flags click the button and add ' ObjC'. ' all_load' and ' force_load' are no longer needed. Details I found some answers on various forums blogs and apple docs. Now I try make short summary of my searches.. application from responding to a selector that is defined in the category. And their solution To resolve this issue the static library should pass the ObjC option to the linker. This flag causes the linker to load every object file in the library that defines an Objective C class or category. While this option will.. is also recommendation in iPhone Development FAQ How do I link all the Objective C classes in a static library Set the Other Linker Flags build setting to ObjC. and flags descriptions all_load Loads all members of static archive libraries. ObjC Loads all members of static archive libraries that implement an Objective C..
What does the -all_load linker flag do? http://stackoverflow.com/questions/2906147/what-does-the-all-load-linker-flag-do technical note http developer.apple.com mac library qa qa2006 qa1490.html IMPORTANT For 64 bit and iPhone OS applications there is a linker bug that prevents ObjC from loading objects files from static libraries that contain only categories and no classes. The workaround is to use the all_load or force_load flags. all_load..
Having trouble adding objects to NSMutableArray in Objective C http://stackoverflow.com/questions/851926/having-trouble-adding-objects-to-nsmutablearray-in-objective-c when stepping through the code at no point does CardIdObject appear in viewedCardsArray . Looking through SO I know these basic questions are pretty common to ObjC newbies like me so apologies in advance objective c iphone cocoa cocoa touch share improve this question Have you initialized your viewedCardsArray If not..
To ARC or not to ARC? What are the pros and cons? http://stackoverflow.com/questions/8760431/to-arc-or-not-to-arc-what-are-the-pros-and-cons just like it can unroll loops eliminate temporary variables inline functions etc. OK now I will tell you about the small downsides If you're a long time ObjC developer you will twitch for about a week when you see ARC code. You will very quickly get over this. There is some very small complications in bridging to Core.. in dealing with anything that treats an id as a void . Things like C arrays of id can take a little more thinking about to do correctly. Fancy handling of ObjC varargs can also cause trouble. Most things involving math on an ObjC pointer is trickier. You shouldn't have much of this in any case. You cannot put an id in.. C arrays of id can take a little more thinking about to do correctly. Fancy handling of ObjC varargs can also cause trouble. Most things involving math on an ObjC pointer is trickier. You shouldn't have much of this in any case. You cannot put an id in a struct . This is fairly rare but sometimes it's used to pack data. If..
Objective-C - When to use 'self' http://stackoverflow.com/questions/2385980/objective-c-when-to-use-self mainViewController.view.frame UIScreen mainScreen .applicationFrame If I remove the self keyword from the first example the program crashes with the message objc 1296 FREED id message view sent to freed object 0x3b122d0 If I add the self keyword to the second example the program runs fine. Can anyone explain why self is..
Subclass UIButton to add a property http://stackoverflow.com/questions/5500327/subclass-uibutton-to-add-a-property Foundation Foundation.h @interface UIButton Property @property nonatomic retain NSObject property @end UIButton Property.m #import UIButton Property.h #import objc runtime.h @implementation UIButton Property static char UIB_PROPERTY_KEY @dynamic property void setProperty NSObject property objc_setAssociatedObject self UIB_PROPERTY_KEY.. UIButton Property.h #import objc runtime.h @implementation UIButton Property static char UIB_PROPERTY_KEY @dynamic property void setProperty NSObject property objc_setAssociatedObject self UIB_PROPERTY_KEY property OBJC_ASSOCIATION_RETAIN_NONATOMIC NSObject property return NSObject objc_getAssociatedObject self UIB_PROPERTY_KEY.. void setProperty NSObject property objc_setAssociatedObject self UIB_PROPERTY_KEY property OBJC_ASSOCIATION_RETAIN_NONATOMIC NSObject property return NSObject objc_getAssociatedObject self UIB_PROPERTY_KEY @end Example usage #import UIButton Property.h ... UIButton button1 UIButton buttonWithType UIButtonTypeRoundedRect button1.property..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers then apparently demonstrates the best practices using an example with the UIImagePickerController. I wish the videos were available Ok so... I'm afraid my objc fu is not so strong. I'm also a bit confused by the final line in the above quote. I've been doing my fair share of googling about this and I found what appears..
iOS 5 Best Practice (Release/retain?) http://stackoverflow.com/questions/6308425/ios-5-best-practice-release-retain shouldn't need to be updated to work with ARC. Here's what Apple says about opting out of ARC for specific files When you migrate a project to use ARC the fobjc arc compiler flag is set as the default for all Objective C source files. You can disable ARC for a specific class using the fno objc arc compiler flag for that.. project to use ARC the fobjc arc compiler flag is set as the default for all Objective C source files. You can disable ARC for a specific class using the fno objc arc compiler flag for that class. In Xcode in the target Build Phases tab open the Compile Sources group to reveal the source file list. Double click the file for..
Undefined symbols for architecture i386: _OBJC_CLASS_$_SKPSMTPMessage", referenced from: error http://stackoverflow.com/questions/6984368/undefined-symbols-for-architecture-i386-objc-class-skpsmtpmessage-refere i.e. SKPSMTPMessage. Can somebody suggest me why i am getting this error Undefined symbols for architecture i386 _OBJC_CLASS_ _SKPSMTPMessage referenced from objc class ref in ConfirmController.o _kSKPSMTPPartContentTransferEncodingKey referenced from ConfirmController sendEmail in ConfirmController.o _kSKPSMTPPartMessageKey..
To ARC or not to ARC? What are the pros and cons? http://stackoverflow.com/questions/8760431/to-arc-or-not-to-arc-what-are-the-pros-and-cons in time to the termination of your program. If you're catching a significant number of ObjC exceptions you're using them incorrectly. This is fixable using fobjc arc exceptions but it incurs the penalties discussed below ARC will not leak memory during ObjC or C exception throws in ObjC code but this is at the cost of both.. out there ARC is brilliant and there is no reason at all to avoid it provided you can handle the OS version restrictions . For non ARC code you can pass fno objc arc on a file by file basis. Xcode unfortunately makes this much harder than it should be to do in practice. You should probably move non ARC code into a separate..
file was built for archive which is not the architecture being linked (i386) http://stackoverflow.com/questions/10803211/file-was-built-for-archive-which-is-not-the-architecture-being-linked-i386 not the architecture being linked i386 Undefined symbols for architecture i386 _OBJC_CLASS_ _netUtils referenced from objc class ref in ViewController.o ld symbol s not found for architecture i386 clang error linker command failed with exit code..
Method Swizzle on iPhone device http://stackoverflow.com/questions/1637604/method-swizzle-on-iphone-device on method swizzling here . Mike Ash has a relatively simple implementation at the bottom of that page #import objc runtime.h #import objc message.h .... void Swizzle Class c SEL orig SEL new Method origMethod class_getInstanceMethod c.. here . Mike Ash has a relatively simple implementation at the bottom of that page #import objc runtime.h #import objc message.h .... void Swizzle Class c SEL orig SEL new Method origMethod class_getInstanceMethod c orig Method newMethod class_getInstanceMethod..
Implementing Unit Testing with the iPhone SDK http://stackoverflow.com/questions/2002330/implementing-unit-testing-with-the-iphone-sdk 'i386' Developer Tools RunPlatformUnitTests.include 419 note Running tests for architecture 'i386' GC OFF objc 12589 GC forcing GC OFF because OBJC_DISABLE_GC is set Test Suite ' Users james Desktop FYP 3D Pool build Debug iphonesimulator..
Objective-C - When to use 'self' http://stackoverflow.com/questions/2385980/objective-c-when-to-use-self mainScreen .applicationFrame If I remove the self keyword from the first example the program crashes with the message objc 1296 FREED id message view sent to freed object 0x3b122d0 If I add the self keyword to the second example the program runs..
Dismissing UIAlertViews when entering background state http://stackoverflow.com/questions/3105974/dismissing-uialertviews-when-entering-background-state the observer then to avoid multiple registrations to the notification center. #import UIAlertViewAutoDismiss.h #import objc runtime.h @interface UIAlertViewAutoDismiss UIAlertViewDelegate id UIAlertViewDelegate __unsafe_unretained privateDelegate.. implement all protocol methods to forward to the real delegate. id forwardingTargetForSelector SEL aSelector struct objc_method_description hasMethod protocol_getMethodDescription @protocol UIAlertViewDelegate aSelector NO YES if hasMethod.name..
Xcode4 Linking Problem. File was built for archive which is not the architecture being linked (arm6) http://stackoverflow.com/questions/5303933/xcode4-linking-problem-file-was-built-for-archive-which-is-not-the-architecture architecture being linked armv6 Undefined symbols for architecture armv6 _OBJC_CLASS_ _TKLoadingView referenced from objc class ref in RootViewController.o I opened the TapkuLibrary and checked that it's Architectures set to 'Standard armv6 armv7..
Subclass UIButton to add a property http://stackoverflow.com/questions/5500327/subclass-uibutton-to-add-a-property Property @property nonatomic retain NSObject property @end UIButton Property.m #import UIButton Property.h #import objc runtime.h @implementation UIButton Property static char UIB_PROPERTY_KEY @dynamic property void setProperty NSObject property.. @implementation UIButton Property static char UIB_PROPERTY_KEY @dynamic property void setProperty NSObject property objc_setAssociatedObject self UIB_PROPERTY_KEY property OBJC_ASSOCIATION_RETAIN_NONATOMIC NSObject property return NSObject objc_getAssociatedObject.. self UIB_PROPERTY_KEY property OBJC_ASSOCIATION_RETAIN_NONATOMIC NSObject property return NSObject objc_getAssociatedObject self UIB_PROPERTY_KEY @end Example usage #import UIButton Property.h ... UIButton button1 UIButton buttonWithType..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers practices using an example with the UIImagePickerController. I wish the videos were available Ok so... I'm afraid my objc fu is not so strong. I'm also a bit confused by the final line in the above quote. I've been doing my fair share of googling..
iOS 5 Best Practice (Release/retain?) http://stackoverflow.com/questions/6308425/ios-5-best-practice-release-retain with ARC. Here's what Apple says about opting out of ARC for specific files When you migrate a project to use ARC the fobjc arc compiler flag is set as the default for all Objective C source files. You can disable ARC for a specific class using.. flag is set as the default for all Objective C source files. You can disable ARC for a specific class using the fno objc arc compiler flag for that class. In Xcode in the target Build Phases tab open the Compile Sources group to reveal the source..
http://stackoverflow.com/questions/6662730/nsnumber-vs-int making a ton of duplicate NSNumber s. Such occurrences are practical only rarely beyond serialization and generic objc interfaces bindings transformers dictionaries . Update Details The ObjC runtime will in some cases on some architectures..
Undefined symbols for architecture i386: _OBJC_CLASS_$_SKPSMTPMessage", referenced from: error http://stackoverflow.com/questions/6984368/undefined-symbols-for-architecture-i386-objc-class-skpsmtpmessage-refere me why i am getting this error Undefined symbols for architecture i386 _OBJC_CLASS_ _SKPSMTPMessage referenced from objc class ref in ConfirmController.o _kSKPSMTPPartContentTransferEncodingKey referenced from ConfirmController sendEmail in..
What are the advantages and disadvantages of using ARC? [closed] http://stackoverflow.com/questions/7888568/what-are-the-advantages-and-disadvantages-of-using-arc try ARC. A lot of people struggle with or try to ignore common practices of MRC example I've introduced a number of objc devs to the static analyzer . If you want to avoid those issues ARC will allow you to postpone your understanding you cannot.. . If you want to avoid those issues ARC will allow you to postpone your understanding you cannot write nontrivial objc programs without understanding reference counting and object lifetimes and relationships whether MRC ARC or GC. ARC and..
ARC forbids Objective-C objects in structs or unions despite marking the file -fno-objc-arc http://stackoverflow.com/questions/8093099/arc-forbids-objective-c-objects-in-structs-or-unions-despite-marking-the-file-f forbids Objective C objects in structs or unions despite marking the file fno objc arc ARC forbids Objective C objects in structs or unions despite marking the file fno objc arc Why is this so I had the.. marking the file fno objc arc ARC forbids Objective C objects in structs or unions despite marking the file fno objc arc Why is this so I had the assumption that if you mark it fno objc arc you don't have this restriction. iphone objective.. in structs or unions despite marking the file fno objc arc Why is this so I had the assumption that if you mark it fno objc arc you don't have this restriction. iphone objective c struct ios5 automatic ref counting share improve this question..
To ARC or not to ARC? What are the pros and cons? http://stackoverflow.com/questions/8760431/to-arc-or-not-to-arc-what-are-the-pros-and-cons If you're catching a significant number of ObjC exceptions you're using them incorrectly. This is fixable using fobjc arc exceptions but it incurs the penalties discussed below ARC will not leak memory during ObjC or C exception throws in.. no reason at all to avoid it provided you can handle the OS version restrictions . For non ARC code you can pass fno objc arc on a file by file basis. Xcode unfortunately makes this much harder than it should be to do in practice. You should..
Loop through all object properties at runtime http://stackoverflow.com/questions/9269372/loop-through-all-object-properties-at-runtime API to loop through and print information about each property in a class #import Foundation Foundation.h #import objc runtime.h @interface TestClass NSObject @property nonatomic retain NSString firstName @property nonatomic retain NSString.. lastName @synthesize age @end int main int argc char argv @autoreleasepool unsigned int numberOfProperties 0 objc_property_t propertyArray class_copyPropertyList TestClass class numberOfProperties for NSUInteger i 0 i numberOfProperties.. propertyArray class_copyPropertyList TestClass class numberOfProperties for NSUInteger i 0 i numberOfProperties i objc_property_t property propertyArray i NSString name NSString alloc initWithUTF8String property_getName property NSString..
How to add a UIImage in MailComposer Sheet of MFMailComposeViewController http://stackoverflow.com/questions/1527351/how-to-add-a-uiimage-in-mailcomposer-sheet-of-mfmailcomposeviewcontroller email you need to get a base64 encoder into your project. There are several out there mostly C though but the simplest ObjC one I found was called NSData Base64 by Matt Gallagher I took the out of the name after copying it in because it gave me..
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library Navigator click your app's target then build settings then search for Other Linker Flags click the button and add ' ObjC'. ' all_load' and ' force_load' are no longer needed. Details I found some answers on various forums blogs and apple docs... selector that is defined in the category. And their solution To resolve this issue the static library should pass the ObjC option to the linker. This flag causes the linker to load every object file in the library that defines an Objective C class.. FAQ How do I link all the Objective C classes in a static library Set the Other Linker Flags build setting to ObjC. and flags descriptions all_load Loads all members of static archive libraries. ObjC Loads all members of static archive..
What does the -all_load linker flag do? http://stackoverflow.com/questions/2906147/what-does-the-all-load-linker-flag-do mac library qa qa2006 qa1490.html IMPORTANT For 64 bit and iPhone OS applications there is a linker bug that prevents ObjC from loading objects files from static libraries that contain only categories and no classes. The workaround is to use the..
http://stackoverflow.com/questions/4543582/how-to-use-gdata-in-iphone settings. Header Search Paths usr include libxml2 .. gdata objectivec client 1.9.1 Source Other Linker Flags lxml2 ObjC For the Debug build configuration only add the Other C Flags setting so that the library ™s debug only code is included Other..
Apple Mach-O Linker Error when compiling for device http://stackoverflow.com/questions/5329001/apple-mach-o-linker-error-when-compiling-for-device Intermediates iParcel.build Debug iphoneos iParcel.build Objects normal armv7 iParcel.LinkFileList dead_strip all_load ObjC lxml2 miphoneos version min 3.2 framework UIKit framework CoreGraphics framework QuartzCore Users yveswheeler Library Developer..
Having trouble adding objects to NSMutableArray in Objective C http://stackoverflow.com/questions/851926/having-trouble-adding-objects-to-nsmutablearray-in-objective-c does CardIdObject appear in viewedCardsArray . Looking through SO I know these basic questions are pretty common to ObjC newbies like me so apologies in advance objective c iphone cocoa cocoa touch share improve this question Have you initialized..
To ARC or not to ARC? What are the pros and cons? http://stackoverflow.com/questions/8760431/to-arc-or-not-to-arc-what-are-the-pros-and-cons temporary variables inline functions etc. OK now I will tell you about the small downsides If you're a long time ObjC developer you will twitch for about a week when you see ARC code. You will very quickly get over this. There is some very.. an id as a void . Things like C arrays of id can take a little more thinking about to do correctly. Fancy handling of ObjC varargs can also cause trouble. Most things involving math on an ObjC pointer is trickier. You shouldn't have much of this.. about to do correctly. Fancy handling of ObjC varargs can also cause trouble. Most things involving math on an ObjC pointer is trickier. You shouldn't have much of this in any case. You cannot put an id in a struct . This is fairly rare..
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