xcode4

In my app I am trying to draw with different colors. I have my own color picker, but I want to add to this picker slider for color brightness. For understudying : I choose a color which is displayed somewhere in view as background color and to this color I want add slider which will slide from 1 to 0 and change brightness of the color and displays the color in window. Therefore I want to ask if there is any possible way how to convert. in my project I use this : CGContextSetRGBStrokeColor(current, R, G, B, A); so anytime I slide the slider I need to change the brightness of the color,

I'm uploading videos to a web server after choosing the video using the UIImagePickerController. However, videos shot with the camera in landscapeRight orientation are inverted on the server. I want to use AVFoundation to rotate the video before uploading. I've figured out how to get the size and preferredRotation of the video using AVAsset. Now I need to apply an affine transform to the video before uploading. Here's an example of the size and transform from a landscapeRight video: 2011-01-07 20:07:30.024 MySecretApp[1442:307] size.width = 1280.000000 size.height = 720.000000 2011-01-07 20:07

Using Xcode 4.0.2 , I have a target that compiles, links, and runs properly in the simulator. However when I compile and link it for an iOS device I get the following (full) linker error: Ld /Users/mike/Library/Developer/Xcode/DerivedData/FOObar-ezjrxybxyybadxguvscgaqtaelju/Build/Products/Debug-iphoneos/FrameworkHarness.app/FrameworkHarness normal armv7 cd /Users/mike/src/FOO/FOObar setenv IPHONEOS_DEPLOYMENT_TARGET 4.2 setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin

what does RELEASE_SAFELY or RELEASE_CF_SAFELY mean? Ok, it's for releasing objects but why not use [obj release] ? Besides I tried to use it in xcode 4 but I am running into buid errors: Undefined symbols for architecture i386: "_RELEASE_SAFELY", referenced from: -[AdressBookModel search:] in AdressBookModel.o ld: symbol(s) not found for architecture i386 collect2: ld returned 1 exit status Can I do just [obj release] instead? What would you consider? RELEASE_SAFELY is not a function but a macro and is usually defined like this: #define RELEASE_SAFELY(__POINTER) { [__POINTER release]; _

There have been posts about how to use exception breakpoint in Xcode. But my question is what exactly that is? It seems that I get a much complete stack trace when I enable exception breakpoint for all exceptions. Why is that so? Also I don't get error messages anymore. I am just really curious about how exception break points work. Thanks It's just a GUI wrapper around setting a symbolic breakpoint on objc_exception_throw . objc_exception_throw is just a C function that is used to raise all exceptions. So it's just like breaking on any function. You don't get log messages any more because the

I currently use CMake to create my iOS xcode project, for both my static libs and application target. Now would like to create the unit test target from CMake as well, but haven't found any resources on whether CMake supports this or how to create the octest target. Can I create this from CMake? If so, could you explain how? No, CMake doesn't support unit tests on iOS. Also you can not run separate executables on iOS. One of the solutions could be compiling your unit tests into a static library instead of executable and then link them to your XCTests or OCTests. You can do some magic with