2014/10/15 下午 10:04:55

iphone Programming Glossary: cast

http://stackoverflow.com/questions/1539017/nsarray-with-c-types

compiles but a warning is thrown warning passing argument 1 of 'objectForKey ' makes pointer from integer without a cast Thus my question How can I store C types in a mutable array Best heinrich objective c iphone share improve this question.. any CFType works just as it would on an NSObject. If you were to put a category on NSObject implementing foo and then cast some random CFType to id and send it the foo message you'd see your implementation of foo invoked. So the compiler warning..

Strange problem comparing floats in objective-C

http://stackoverflow.com/questions/1614533/strange-problem-comparing-floats-in-objective-c

0.1 the if statement is not fulfilled and the code not executed I found out that I can fix this by casting 0.1 to float. Like this if self.scroller.currentValue float 0.1 This works fine. Can anyone explain to my why this is.. explain to my why this is happening Is 0.1 defined as a double by default or something Thanks. iphone objective c casting floating point share improve this question I believe having not found the standard that says so that when comparing.. question I believe having not found the standard that says so that when comparing a float to a double the float is cast to a double before comparing. Floating point numbers without a modifier are considered to be double in C. However in C there..

iPhone Proximity Sensor

http://stackoverflow.com/questions/165539/iphone-proximity-sensor

sensor inside the ear speaker. If you start the phone app you don't have to be making a call and hold something to cast a shadow over the ear speaker you can make the display shut off. When you asked this question it was not accessible via..

How to properly release an AVCaptureSession

http://stackoverflow.com/questions/3741121/how-to-properly-release-an-avcapturesession

second thread where the sample buffers are processed. static void capture_cleanup void p AugmReality ar AugmReality p cast to original context instance ar release releases capture session if dealloc is called ... dispatch_queue_t queue dispatch_queue_create..

How do you explicitly animate a CALayer's backgroundColor?

http://stackoverflow.com/questions/518192/how-do-you-explicitly-animate-a-calayers-backgroundcolor

or fromValue properties of a CABasicAnimation. Simply use the CGColorRef. To avoid the compiler warning you can cast the CGColorRef to an id. In my sample app the following code animated the background to red. CABasicAnimation selectionAnimation..

Subclass UIButton to add a property

http://stackoverflow.com/questions/5500327/subclass-uibutton-to-add-a-property

selector sent to instance 0x593e920 Thus from ButtonWithType i obtain a UIRoundedRectButton and Mybutton can't cast it... What i have to do to obtain a MyButton object is init the unique solution Thank you iphone objective c ios uibutton..

Download music file from server and save in my app

http://stackoverflow.com/questions/5620849/download-music-file-from-server-and-save-in-my-app

gonna need... For the progress bar in the NSURLConnectionDelegate method didReceiveResponse you take the NSURLResponse cast it to a NSHTTPURLResponse and retrieve the size of the file you're downloading using the expectedContentLength method. And..

Unhiding a view is very slow in CTCallCenter callEventHandler

http://stackoverflow.com/questions/6274642/unhiding-a-view-is-very-slow-in-ctcallcenter-calleventhandler

@ after show Note The parameter is an NSNotification not an NSDictionary I would not compare strings with No need to cast the view to change the hidden property Use NO instead of false Update Got an idea Could you try the following please in..

How to parse nested JSON objects with JSON framework and Objective-C/iPhone/Xcode?

http://stackoverflow.com/questions/692247/how-to-parse-nested-json-objects-with-json-framework-and-objective-c-iphone-xcod

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

to the actual method signature of the method but will not always match exactly. Once you have the IMP you need to cast it to a function pointer that includes all of the details that ARC needs including the two implicit hidden arguments self.. you'll probably eventually send a message to a zombie and crash. There are ways to work around this with bridged casting but really it'd be better to simply use the IMP and function pointer methodology above. Since consumed parameters are..

iPhone fetch data dictionary from keychain

http://stackoverflow.com/questions/7827730/iphone-fetch-data-dictionary-from-keychain

You don't need to disable ARC for this you just need to declare the query's result as a CFDictionaryRef then cast it to an NSDictionary after the call. 1 CFDictionaryRef cfquery __bridge_retained CFDictionaryRef genericPasswordQuery 2.. to make sure ARC does not release and deallocate the object while we are working with it. This kind of bridging cast retains the object so to prevent leaks it must be followed with a corresponding CFRelease somewhere. SecItemCopyMatching.. __bridge_transfer lets ARC know about this responsibility so it will be able to do it for us automatically. Don't cast the immutable Core Foundation dictionary returned by SecItemCopyMatching to NSMutableDictionary that's just wrong. Also..

XCode 4 warning "Expression result unused??for NSURLConnection

http://stackoverflow.com/questions/7914990/xcode-4-warning-expression-result-unused-for-nsurlconnection

c ios xcode warnings share improve this question When a function returns a result that you don't need you can cast it to void to eliminate the compiler warning void NSURLConnection alloc initWithRequest request delegate self I haven't..

How can I compile lame as static library(.a) for armv6 and armv7 of iPhone?

http://stackoverflow.com/questions/9207063/how-can-i-compile-lame-as-static-library-a-for-armv6-and-armv7-of-iphone

warning implicit declaration of function 勇getstr console.c 92 warning assignment makes pointer from integer without a cast console.c In function 𦴨et_termcap_number console.c 102 warning implicit declaration of function 勇getnum console.c In function..

MKMapView annotations changing/losing order?

http://stackoverflow.com/questions/9539802/mkmapview-annotations-changing-losing-order

viewForAnnotation MyClass annotation static NSString identifier @ MyIdentifier the result of the call is being cast MKPinAnnotationView to the correct view class or else the compiler complains MKPinAnnotationView annotationView MKPinAnnotationView..