2014/10/15 下午 10:12:16
iphone Programming Glossary: objectsHow to intercept touches events on a MKMapView or UIWebView objects? http://stackoverflow.com/questions/1049889/how-to-intercept-touches-events-on-a-mkmapview-or-uiwebview-objects to intercept touches events on a MKMapView or UIWebView objects I'm not sure what i'm doing wrong but I try to catch touches on a MKMapView object. I subclassed it..
Send and receive messages through NSNotificationCenter in Objective-C? [closed] http://stackoverflow.com/questions/2191594/send-and-receive-messages-through-nsnotificationcenter-in-objective-c remove yourself as an observer the Notification Center will continue to try and send notification objects to the deallocated object. NSNotificationCenter defaultCenter removeObserver self super dealloc id init..
How to store custom objects in NSUserDefaults http://stackoverflow.com/questions/2315948/how-to-store-custom-objects-in-nsuserdefaults to store custom objects in NSUserDefaults Alright so I've been doing some poking around and I realize my problem but I don't.. my problem but I don't know how to fix it. I have made a custom class to hold some data. I make objects for this class and I need to them to last between sessions. Before I was putting all my information.. read up that apparently NSUserDefaults only stores some types of information. So how an I get my objects into NSUSerDefaults I read that there should be a way to to encode my custom object and then put it..
How do you use NSAttributedString? http://stackoverflow.com/questions/3482346/how-do-you-use-nsattributedstring often and so I would prefer not to use any calculations to re position 3 separate NSString objects. If it's possible using NSAttributedString how do I make the following if not possible with NSAttributed..
Prefixing property names with an underscore in Objective C [duplicate] http://stackoverflow.com/questions/3521254/prefixing-property-names-with-an-underscore-in-objective-c name as the property indicates that's the pattern they expect you to follow. No matter what since objects still have to send messages to themselves to access properties it's hard to confuse when you're accessing..
How do I export UIImage array as a movie? http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie I export UIImage array as a movie I have a serious problem I have an array with several UIImage objects. What I now want to do is create movie from those images. But I don't have any idea how to do so. I..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints can. Use larger tileSizes if rendering on TiledLayers init frequently used arrays with placeholder objects alternitively another design approach is this one Note that images will render faster than a CGPDFPageRef.. can especially if they will be using memory beware of leaving contexts open though Recycle page objects by doing pointer swaps or destroy unused views Close any open Contexts as soon as you don't need them..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers approaches to listening observing.html Method #5 even indicates delegates as an method Except.... objects can only set one delegate at a time. So when I have multiple viewcontroller communication what am I.. First I agree with the previous answers which focus on the importance of putting data in model objects when appropriate per the MVC design pattern . Usually you want to avoid putting state information inside.. injection design pattern. In a nutshell this means that your controller shouldn't look up the objects it needs to do its job e.g. reference a global variable . Instead you should always inject those dependencies..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown the controller for the C function pointer for the method corresponding to the controller. All objects respond to methodForSelector and it works through some lower level Objective C runtime methods so you.. calling returns a new object . For selectors you're trying to call that return void or other non objects you could enable compiler features to ignore the warning but it may be dangerous. I've seen Clang go.. added when you call a method. 2 Actually it's possible for it to get the wrong info if declare you objects as id and you're not importing all headers. You could end up with crashes in code that the compiler..
How to intercept touches events on a MKMapView or UIWebView objects? http://stackoverflow.com/questions/1049889/how-to-intercept-touches-events-on-a-mkmapview-or-uiwebview-objects to intercept touches events on a MKMapView or UIWebView objects I'm not sure what i'm doing wrong but I try to catch touches on a MKMapView object. I subclassed it by creating the following class #import UIKit UIKit.h #import..
Send and receive messages through NSNotificationCenter in Objective-C? [closed] http://stackoverflow.com/questions/2191594/send-and-receive-messages-through-nsnotificationcenter-in-objective-c @implementation TestClass void dealloc If you don't remove yourself as an observer the Notification Center will continue to try and send notification objects to the deallocated object. NSNotificationCenter defaultCenter removeObserver self super dealloc id init self super init if self return nil Add this instance of..
How to store custom objects in NSUserDefaults http://stackoverflow.com/questions/2315948/how-to-store-custom-objects-in-nsuserdefaults to store custom objects in NSUserDefaults Alright so I've been doing some poking around and I realize my problem but I don't know how to fix it. I have made a custom class to hold some.. Alright so I've been doing some poking around and I realize my problem but I don't know how to fix it. I have made a custom class to hold some data. I make objects for this class and I need to them to last between sessions. Before I was putting all my information in NSUserDefaults but this isn't working. NSUserDefaults setObject.. I put my custom class Player in the NSUserDefaults. Now I've read up that apparently NSUserDefaults only stores some types of information. So how an I get my objects into NSUSerDefaults I read that there should be a way to to encode my custom object and then put it in but I'm not sure how to implement it help would be appreciated..
How do you use NSAttributedString? http://stackoverflow.com/questions/3482346/how-do-you-use-nsattributedstring of each of the three NSAttributedString substrings will be changing often and so I would prefer not to use any calculations to re position 3 separate NSString objects. If it's possible using NSAttributedString how do I make the following if not possible with NSAttributed string how would you do it Edit Remember @ first @ second..
Prefixing property names with an underscore in Objective C [duplicate] http://stackoverflow.com/questions/3521254/prefixing-property-names-with-an-underscore-in-objective-c accessors for a property will access the ivar with the same name as the property indicates that's the pattern they expect you to follow. No matter what since objects still have to send messages to themselves to access properties it's hard to confuse when you're accessing a property or when you're accessing its backing ivar directly..
How do I export UIImage array as a movie? http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie do I export UIImage array as a movie I have a serious problem I have an array with several UIImage objects. What I now want to do is create movie from those images. But I don't have any idea how to do so. I hope someone can help me or send me a code snippet which does..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints Matt Gallagher Johann Save any media to disk when you can. Use larger tileSizes if rendering on TiledLayers init frequently used arrays with placeholder objects alternitively another design approach is this one Note that images will render faster than a CGPDFPageRef Use NSOperations or GCD Blocks to prepare pages ahead.. docRef into a singleton. Cancel needless NSOperations When you can especially if they will be using memory beware of leaving contexts open though Recycle page objects by doing pointer swaps or destroy unused views Close any open Contexts as soon as you don't need them on receiving memory warnings release and reload the DocRef..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers Notification techniques http cocoawithlove.com 2008 06 five approaches to listening observing.html Method #5 even indicates delegates as an method Except.... objects can only set one delegate at a time. So when I have multiple viewcontroller communication what am I to do Ok that's the set up gang. I know I can easily do my communication.. how to do it right instead of just hacking it together. First I agree with the previous answers which focus on the importance of putting data in model objects when appropriate per the MVC design pattern . Usually you want to avoid putting state information inside a controller unless it's strictly presentation data. Second.. if you think about them in the context of the dependency injection design pattern. In a nutshell this means that your controller shouldn't look up the objects it needs to do its job e.g. reference a global variable . Instead you should always inject those dependencies into the controller i.e. pass in the objects it needs..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown selector Explanation What's going on here is you're asking the controller for the C function pointer for the method corresponding to the controller. All objects respond to methodForSelector and it works through some lower level Objective C runtime methods so you could do this directly with the runtime API as well . These.. to be released as in #3 above that is the method you're calling returns a new object . For selectors you're trying to call that return void or other non objects you could enable compiler features to ignore the warning but it may be dangerous. I've seen Clang go through a few iterations of how it handles return values that.. have two hidden arguments self and _cmd that are implicitly added when you call a method. 2 Actually it's possible for it to get the wrong info if declare you objects as id and you're not importing all headers. You could end up with crashes in code that the compiler thinks is fine. This is very rare but could happen. Usually..
How to intercept touches events on a MKMapView or UIWebView objects? http://stackoverflow.com/questions/1049889/how-to-intercept-touches-events-on-a-mkmapview-or-uiwebview-objects to intercept touches events on a MKMapView or UIWebView objects I'm not sure what i'm doing wrong but I try to catch touches on a MKMapView object. I subclassed it by creating the following..
Send and receive messages through NSNotificationCenter in Objective-C? [closed] http://stackoverflow.com/questions/2191594/send-and-receive-messages-through-nsnotificationcenter-in-objective-c dealloc If you don't remove yourself as an observer the Notification Center will continue to try and send notification objects to the deallocated object. NSNotificationCenter defaultCenter removeObserver self super dealloc id init self super init..
How to store custom objects in NSUserDefaults http://stackoverflow.com/questions/2315948/how-to-store-custom-objects-in-nsuserdefaults to store custom objects in NSUserDefaults Alright so I've been doing some poking around and I realize my problem but I don't know how to fix it... around and I realize my problem but I don't know how to fix it. I have made a custom class to hold some data. I make objects for this class and I need to them to last between sessions. Before I was putting all my information in NSUserDefaults but.. Now I've read up that apparently NSUserDefaults only stores some types of information. So how an I get my objects into NSUSerDefaults I read that there should be a way to to encode my custom object and then put it in but I'm not sure..
How do you use NSAttributedString? http://stackoverflow.com/questions/3482346/how-do-you-use-nsattributedstring substrings will be changing often and so I would prefer not to use any calculations to re position 3 separate NSString objects. If it's possible using NSAttributedString how do I make the following if not possible with NSAttributed string how would..
Prefixing property names with an underscore in Objective C [duplicate] http://stackoverflow.com/questions/3521254/prefixing-property-names-with-an-underscore-in-objective-c ivar with the same name as the property indicates that's the pattern they expect you to follow. No matter what since objects still have to send messages to themselves to access properties it's hard to confuse when you're accessing a property or..
How do I export UIImage array as a movie? http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie do I export UIImage array as a movie I have a serious problem I have an array with several UIImage objects. What I now want to do is create movie from those images. But I don't have any idea how to do so. I hope someone can help..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints to disk when you can. Use larger tileSizes if rendering on TiledLayers init frequently used arrays with placeholder objects alternitively another design approach is this one Note that images will render faster than a CGPDFPageRef Use NSOperations.. NSOperations When you can especially if they will be using memory beware of leaving contexts open though Recycle page objects by doing pointer swaps or destroy unused views Close any open Contexts as soon as you don't need them on receiving memory..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers 2008 06 five approaches to listening observing.html Method #5 even indicates delegates as an method Except.... objects can only set one delegate at a time. So when I have multiple viewcontroller communication what am I to do Ok that's the.. hacking it together. First I agree with the previous answers which focus on the importance of putting data in model objects when appropriate per the MVC design pattern . Usually you want to avoid putting state information inside a controller unless.. of the dependency injection design pattern. In a nutshell this means that your controller shouldn't look up the objects it needs to do its job e.g. reference a global variable . Instead you should always inject those dependencies into the controller..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown on here is you're asking the controller for the C function pointer for the method corresponding to the controller. All objects respond to methodForSelector and it works through some lower level Objective C runtime methods so you could do this directly.. is the method you're calling returns a new object . For selectors you're trying to call that return void or other non objects you could enable compiler features to ignore the warning but it may be dangerous. I've seen Clang go through a few iterations.. that are implicitly added when you call a method. 2 Actually it's possible for it to get the wrong info if declare you objects as id and you're not importing all headers. You could end up with crashes in code that the compiler thinks is fine. This..
UITableViewCell's imageView fit to 40x40 http://stackoverflow.com/questions/1055495/uitableviewcells-imageview-fit-to-40x40 0 0 50 50 cell.imageView setContentMode UIViewContentModeScaleAspectFill I am using SDK 3.0 with build in Cell Objects in Predefined Styles . objective c iphone uitableviewcell uiimageview share improve this question I put Ben's code..
How to use NSzombie in xcode? [duplicate] http://stackoverflow.com/questions/1211923/how-to-use-nszombie-in-xcode
OpenCV.Framework does not compile for the armv7s architecture http://stackoverflow.com/questions/12491046/opencv-framework-does-not-compile-for-the-armv7s-architecture invocation BUILD FAILED The following build commands failed Ld build MyProject.build Debug iphoneos MyProject.build Objects normal armv7s MyProject normal armv7s 1 failure As I understood this is due to the new armv7s architecture. OpenCV is apparently..
How to convert NSArray to NSData? http://stackoverflow.com/questions/1286212/how-to-convert-nsarray-to-nsdata to the NSCoding protocol. If these are custom objects then that means you need to read up on Encoding and Decoding Objects . Note that this will create a fairly hard to read property list format but can handle a very wide range of objects. If..
iPhone: Duplicate Symbol Error? http://stackoverflow.com/questions/2264455/iphone-duplicate-symbol-error fabian Development Workspaces iphone_experiments xcode_build_output MausLog.build Debug iphonesimulator MausLog.build Objects normal i386 BlogTableItemCell 3733583914888A7B.o and Users fabian Development Workspaces iphone_experiments xcode_build_output.. fabian Development Workspaces iphone_experiments xcode_build_output MausLog.build Debug iphonesimulator MausLog.build Objects normal i386 BlogTableItemCell 3733583914888A7B.o collect2 ld returned 1 exit status Command Developer Platforms iPhoneSimulator.platform..
What does this ^ syntax mean in Objective-C? http://stackoverflow.com/questions/3499186/what-does-this-syntax-mean-in-objective-c C in Snow Leopard. Lots more info available at http developer.apple.com mac articles cocoa introblocksgcd.html Block Objects Block objects informally �blocks are an extension to C as well as Objective C and C that make it easy for programmers to..
NSFetchedResultsController custom sort not getting called http://stackoverflow.com/questions/4789782/nsfetchedresultscontroller-custom-sort-not-getting-called custom compare here with print statement NSLog @ Sort Descriptor Set NSArray sortDescriptors NSArray alloc initWithObjects sortDescriptor nil NSEntityDescription entity NSEntityDescription entityForName @ Object inManagedObjectContext self.managedObjectContext.. fetchRequest managedObjectContext self.managedObjectContext sectionNameKeyPath @ firstLetterOfObject cacheName @ Objects aFetchedResultsController release fetchRequest release sortDescriptor release sortDescriptors release if fetchedResultsController..
Apple Mach-O Linker Error when compiling for device http://stackoverflow.com/questions/5329001/apple-mach-o-linker-error-when-compiling-for-device Xcode DerivedData iParcel fkeqjcjcbbhjwhdssjptkdxzzzxh Build Intermediates iParcel.build Debug iphoneos iParcel.build Objects normal armv7 iParcel normal armv7 cd Users yveswheeler iParcel setenv IPHONEOS_DEPLOYMENT_TARGET 3.2 setenv PATH Developer.. Xcode DerivedData iParcel fkeqjcjcbbhjwhdssjptkdxzzzxh Build 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.. Xcode DerivedData iParcel fkeqjcjcbbhjwhdssjptkdxzzzxh Build Intermediates iParcel.build Debug iphoneos iParcel.build Objects normal armv7 iParcel arm apple darwin10 g 4.2.1 Users yveswheeler Library Developer Xcode DerivedData iParcel fkeqjcjcbbhjwhdssjptkdxzzzxh..
Is there a way to pass touches through on the iPhone? http://stackoverflow.com/questions/631427/is-there-a-way-to-pass-touches-through-on-the-iphone to set the control first iphone cocoa touch share improve this question In the documentation look for Responder Objects and the Responder Chain You can share touches between objects by forwarding the touch up the responder chain. Your UIButton..
NSDefaultRunLoopMode vs NSRunLoopCommonModes http://stackoverflow.com/questions/7222449/nsdefaultrunloopmode-vs-nsrunloopcommonmodes with input sources other than NSConnection objects. This is the most commonly used run loop mode. NSRunLoopCommonModes Objects added to a run loop using this value as the mode are monitored by all run loop modes that have been declared as a member..
Retain Cycles: Why is that such a bad thing? http://stackoverflow.com/questions/791322/retain-cycles-why-is-that-such-a-bad-thing Cycles Why is that such a bad thing There are two Objects A and B. A creates B and retains it. B has an instance variable that points to A retaining it. So both retain eachother...
Why is object not dealloc'ed when using ARC + NSZombieEnabled http://stackoverflow.com/questions/8408071/why-is-object-not-dealloced-when-using-arc-nszombieenabled not being dealloc'ed when that view controller was dealloc'ed. It took a while to figure out why. I have Enable Zombie Objects on for my project while debugging and this turned out to be the cause. Consider the following app logic 1 Users invokes.. when it is dealloc'ed. 4 User dismisses SecondaryViewController to return to RootViewController . With Enable Zombie Objects turned off the above works fine all objects are deallocated. With Enable Zombie Objects on ActionsController is not deallocated.. . With Enable Zombie Objects turned off the above works fine all objects are deallocated. With Enable Zombie Objects on ActionsController is not deallocated even though SecondaryViewController is deallocated. This caused problems in my app..
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