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2014/10/15 ¤U¤È 10:03:56
iphone Programming Glossary: argumenthttp://stackoverflow.com/questions/158914/cropping-a-uiimage image context of my target size. Since I want the center portion of the image I set the CGRect argument passed to drawInRect to something that's larger than the bounds of my image context. I was hoping this..
Is it true that one should not use NSLog() on production code? http://stackoverflow.com/questions/300673/is-it-true-that-one-should-not-use-nslog-on-production-code could have a logging class that writes to its own log file or database and includes a 'priority' argument you could set at runtime so debug messages are not shown in your release version but error messages..
How do you trigger a block after a delay, like -performSelector:withObject:afterDelay:? http://stackoverflow.com/questions/4139219/how-do-you-trigger-a-block-after-a-delay-like-performselectorwithobjectafter a primitive parameter after a delay like using performSelector withObject afterDelay but with an argument like int double float iphone objective c objective c blocks grand central dispatch share improve..
How to capture UIView to UIImage without loss of quality on retina display http://stackoverflow.com/questions/4334233/how-to-capture-uiview-to-uiimage-without-loss-of-quality-on-retina-display UIGraphicsBeginImageContextWithOptions as documented on this page . Pass 0.0 for scale the third argument and you'll get a context with a scale factor equal to that of the screen. UIGraphicsBeginImageContext..
http://stackoverflow.com/questions/4445173/when-to-use-nsinteger-vs-int for iOS I see in the apple sample code they use NSInteger or NSUInteger when passing a value as an argument to a function or returning a value from a function. NSInteger someFunc ... void someFuncWithInt NSInteger..
Is there a way to make drawRect work right NOW? http://stackoverflow.com/questions/4739748/is-there-a-way-to-make-drawrect-work-right-now @selector updateProgress withObject nil waitUntilDone NO Note that I've found the NO argument in the previous method to be needed to get constant UI updates while dealing with a continuous progress..
http://stackoverflow.com/questions/6124109/instance-variables-with-underscore-in-objective-c-2-0-and-renaming-with-synthet variable and properties naming as shown by sebnow in his following answer instance variable method argument naming in Objective C I copy paste his example code here @interface Foo NSObject id _bar @property nonatomic..
Applications are expected to have a root view controller at the end of application launch http://stackoverflow.com/questions/7520971/applications-are-expected-to-have-a-root-view-controller-at-the-end-of-applicati cocoa touch share improve this question I had this same problem. Check your main.m. The last argument should be set to the name of the class that implements the UIApplicationDelegate protocol. retVal UIApplicationMain..
http://stackoverflow.com/questions/158914/cropping-a-uiimage Theory 1 I achieve the cropping by drawing into an offscreen image context of my target size. Since I want the center portion of the image I set the CGRect argument passed to drawInRect to something that's larger than the bounds of my image context. I was hoping this was Kosher but am I instead attempting to draw over other..
Is it true that one should not use NSLog() on production code? http://stackoverflow.com/questions/300673/is-it-true-that-one-should-not-use-nslog-on-production-code interact with normal Objective C objects. For instance you could have a logging class that writes to its own log file or database and includes a 'priority' argument you could set at runtime so debug messages are not shown in your release version but error messages are if you did this you could make DebugLog WarningLog and so..
How do you trigger a block after a delay, like -performSelector:withObject:afterDelay:? http://stackoverflow.com/questions/4139219/how-do-you-trigger-a-block-after-a-delay-like-performselectorwithobjectafter withObject afterDelay Is there a way to call a block with a primitive parameter after a delay like using performSelector withObject afterDelay but with an argument like int double float iphone objective c objective c blocks grand central dispatch share improve this question I think you're looking for dispatch_after ...
How to capture UIView to UIImage without loss of quality on retina display http://stackoverflow.com/questions/4334233/how-to-capture-uiview-to-uiimage-without-loss-of-quality-on-retina-display question Switch from use of UIGraphicsBeginImageContext to UIGraphicsBeginImageContextWithOptions as documented on this page . Pass 0.0 for scale the third argument and you'll get a context with a scale factor equal to that of the screen. UIGraphicsBeginImageContext uses a fixed scale factor of 1.0 so you're actually getting..
http://stackoverflow.com/questions/4445173/when-to-use-nsinteger-vs-int When should I be using NSInteger vs int when developing for iOS I see in the apple sample code they use NSInteger or NSUInteger when passing a value as an argument to a function or returning a value from a function. NSInteger someFunc ... void someFuncWithInt NSInteger value ... But w in a function they're just using int to..
Is there a way to make drawRect work right NOW? http://stackoverflow.com/questions/4739748/is-there-a-way-to-make-drawrect-work-right-now and then to update the UI you can use self performSelectorOnMainThread @selector updateProgress withObject nil waitUntilDone NO Note that I've found the NO argument in the previous method to be needed to get constant UI updates while dealing with a continuous progress bar. This sample application I created for my class illustrates..
http://stackoverflow.com/questions/6124109/instance-variables-with-underscore-in-objective-c-2-0-and-renaming-with-synthet c class work I'm using the same convention for instance variable and properties naming as shown by sebnow in his following answer instance variable method argument naming in Objective C I copy paste his example code here @interface Foo NSObject id _bar @property nonatomic retain id bar id initWithBar id aBar @end @implementation..
Applications are expected to have a root view controller at the end of application launch http://stackoverflow.com/questions/7520971/applications-are-expected-to-have-a-root-view-controller-at-the-end-of-applicati Any know how to fix this issue iphone objective c ios cocoa touch share improve this question I had this same problem. Check your main.m. The last argument should be set to the name of the class that implements the UIApplicationDelegate protocol. retVal UIApplicationMain argc argv nil @ AppDelegate share improve..
NSFetchedResultsController with sections created by first letter of a string http://stackoverflow.com/questions/1112521/nsfetchedresultscontroller-with-sections-created-by-first-letter-of-a-string Following Dave's initial steps to the letter generated issues where it dies upon setPropertiesToFetch with an invalid argument exception. I've logged the code and the debugging information below NSDictionary entityProperties entity propertiesByName..
http://stackoverflow.com/questions/158914/cropping-a-uiimage into an offscreen image context of my target size. Since I want the center portion of the image I set the CGRect argument passed to drawInRect to something that's larger than the bounds of my image context. I was hoping this was Kosher but am..
How get a datetime column in SQLite with Objective C http://stackoverflow.com/questions/1711504/how-get-a-datetime-column-in-sqlite-with-objective-c in an iPhone Application NSDate dateWithSQLiteRepresentation NSString myString NSAssert3 myString @ s d s Invalid argument. myString nil __FILE__ __LINE__ __PRETTY_FUNCTION__ return self sqlLiteDateFormatter dateFromString myString NSDate dateWithSQLiteRepresentation.. timeZone NSString myTimeZone NSString dateWithTimezone nil NSDate result nil NSAssert3 myString @ s d s Invalid argument. myString nil __FILE__ __LINE__ __PRETTY_FUNCTION__ NSAssert3 myTimeZone @ s d s Invalid argument. myTimeZone nil __FILE__.. @ s d s Invalid argument. myString nil __FILE__ __LINE__ __PRETTY_FUNCTION__ NSAssert3 myTimeZone @ s d s Invalid argument. myTimeZone nil __FILE__ __LINE__ __PRETTY_FUNCTION__ dateWithTimezone NSString alloc initWithFormat @ @ @ myString myTimeZone..
SEL performSelector and arguments http://stackoverflow.com/questions/2716143/sel-performselector-and-arguments performSelector and arguments It seems like there should be an easy way to call a selector with some arguments when all you have is a SEL object. I.. performSelector and arguments It seems like there should be an easy way to call a selector with some arguments when all you have is a SEL object. I can't seem to find the correct syntax. MyClass init SEL sel owner NSObject parent.. actually listed in the NSObject protocol documentation . Since NSObject performSelector withObject requires an object argument you will have to write a wrapper in parent's class like void myMethodForNumber NSNumber number self myMethod number intValue..
Is it true that one should not use NSLog() on production code? http://stackoverflow.com/questions/300673/is-it-true-that-one-should-not-use-nslog-on-production-code For instance you could have a logging class that writes to its own log file or database and includes a 'priority' argument you could set at runtime so debug messages are not shown in your release version but error messages are if you did this..
What are block-based animation methods in iPhone OS 4.0? http://stackoverflow.com/questions/3126833/what-are-block-based-animation-methods-in-iphone-os-4-0 delay options animations completion There are also some related transition methods. For each of these the animations argument is a block object animations A block object containing the changes to commit to the views. This is where you programmatically..
How do you trigger a block after a delay, like -performSelector:withObject:afterDelay:? http://stackoverflow.com/questions/4139219/how-do-you-trigger-a-block-after-a-delay-like-performselectorwithobjectafter to call a block with a primitive parameter after a delay like using performSelector withObject afterDelay but with an argument like int double float iphone objective c objective c blocks grand central dispatch share improve this question I think..
How to capture UIView to UIImage without loss of quality on retina display http://stackoverflow.com/questions/4334233/how-to-capture-uiview-to-uiimage-without-loss-of-quality-on-retina-display to UIGraphicsBeginImageContextWithOptions as documented on this page . Pass 0.0 for scale the third argument and you'll get a context with a scale factor equal to that of the screen. UIGraphicsBeginImageContext uses a fixed scale..
http://stackoverflow.com/questions/4445173/when-to-use-nsinteger-vs-int int when developing for iOS I see in the apple sample code they use NSInteger or NSUInteger when passing a value as an argument to a function or returning a value from a function. NSInteger someFunc ... void someFuncWithInt NSInteger value ... But..
Is there a way to make drawRect work right NOW? http://stackoverflow.com/questions/4739748/is-there-a-way-to-make-drawrect-work-right-now self performSelectorOnMainThread @selector updateProgress withObject nil waitUntilDone NO Note that I've found the NO argument in the previous method to be needed to get constant UI updates while dealing with a continuous progress bar. This sample..
NSMutableString as retain/copy http://stackoverflow.com/questions/4995254/nsmutablestring-as-retain-copy a unique mutableCopy just for you besides that's the duty of class's implementation. so NSMutableString is a bad argument for the setter. NSString is the appropriate setter unless you're retaining the string. NSMutableString is also an ambiguous..
What are the Dangers of Method Swizzling in Objective C? http://stackoverflow.com/questions/5339276/what-are-the-dangers-of-method-swizzling-in-objective-c swizzling is not atomic Changes behavior of un owned code Possible naming conflicts Swizzling changes the method's arguments The order of swizzles matters Difficult to understand looks recursive Difficult to debug These points are all valid and.. store return class_swizzleMethodAndStore self original replacement store @end Swizzling changes the method's arguments This is the big one in my mind. This is the reason that standard method swizzling should not be done. You are changing.. is the big one in my mind. This is the reason that standard method swizzling should not be done. You are changing the arguments passed to the original method's implementation. This is where it happens self my_setFrame frame What line does is objc_msgSend..
http://stackoverflow.com/questions/6124109/instance-variables-with-underscore-in-objective-c-2-0-and-renaming-with-synthet for instance variable and properties naming as shown by sebnow in his following answer instance variable method argument naming in Objective C I copy paste his example code here @interface Foo NSObject id _bar @property nonatomic retain id bar..
http://stackoverflow.com/questions/6851660/version-vs-build-in-xcode-4 in your Run Script phase you can use the following script DEVELOPER_BIN_DIR agvtool next version all The next version argument increments the build number bump is also an alias for the same thing and all updates Info.plist with the new build number...
UIScrollView : paging horizontally, scrolling vertically? http://stackoverflow.com/questions/728014/uiscrollview-paging-horizontally-scrolling-vertically scrolling . You won't be able to send touchesBegan to UIScrollView later because you cannot store the touches argument it contains objects that will be mutated before the next touchesMoved event and you cannot reproduce the old state. So you..
Applications are expected to have a root view controller at the end of application launch http://stackoverflow.com/questions/7520971/applications-are-expected-to-have-a-root-view-controller-at-the-end-of-applicati objective c ios cocoa touch share improve this question I had this same problem. Check your main.m. The last argument should be set to the name of the class that implements the UIApplicationDelegate protocol. retVal UIApplicationMain argc..
Scrolling with two fingers with a UIScrollView http://stackoverflow.com/questions/787212/scrolling-with-two-fingers-with-a-uiscrollview cannot be scrolled with two fingers . Try passing only the data for one finger to super by filtering the NSSet touches argument note that it only contains the changed touches and ignoring events for the wrong finger altogether . If that does not work..
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