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出于某种原因，Xcode告诉我，只要我使用类似kCAFillModeForwards的东西，它就不会找到符号。必须有一个图书馆或班级，我必须包括......但哪一个？正常的核心动画的东西很好，像[myView beginAnimations ...]。让更复杂的动画工作起作用有什么窍门？为什么我不能做任何CABasicAnimation或关键帧动画？
我已经包括在.h文件：
#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>
@interface TestClass : UIView {
}
// ...
我运行此代码：
- (void)testAnimation {
CABasicAnimation *fadeInAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
[fadeInAnimation setToValue:[NSNumber numberWithFloat:1.0]];
fadeInAnimation.fillMode = kCAFillModeForwards;
fadeInAnimation.removedOnCompletion = NO;
// other stuff deleted to limit error possibilities...should at least compile
}
这发生在我建（做清理很多次），2个错误：
cd "/Users/thanks/Desktop/Thanks/iPhone Development/TestApp"
setenv MACOSX_DEPLOYMENT_TARGET 10.5
setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.0 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator2.2.1.sdk "-L/Users/thanks/Desktop/Thanks/iPhone Development/TestApp/build/Debug-iphonesimulator" "-F/Users/thanks/Desktop/Thanks/iPhone Development/TestApp/build/Debug-iphonesimulator" -filelist "/Users/thanks/Desktop/Thanks/iPhone Development/TestApp/build/TestApp.build/Debug-iphonesimulator/TestApp.build/Objects-normal/i386/TestApp.LinkFileList" -mmacosx-version-min=10.5 -framework Foundation -framework UIKit -framework CoreGraphics -o "/Users/thanks/Desktop/Thanks/iPhone Development/TestApp/build/Debug-iphonesimulator/TestApp.app/TestApp"
Undefined symbols:
".objc_class_name_CABasicAnimation", referenced from:
[email protected][email protected][email protected] in TestClassTestClass.o
"_kCAFillModeForwards", referenced from:
_kCAFillModeForwards$non_lazy_ptr in TestClass.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
".objc_class_name_CABasicAnimation", referenced from:
[email protected][email protected][email protected] in TestClass.o
"_kCAFillModeForwards", referenced from:
_kCAFillModeForwards$non_lazy_ptr in TestClass.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
它说未定义的符号：
我必须包含一些框架吗？
我已经包括：
CoreGraphics.framework Foundation.framework UIKit.framework
当我删除所有代码，但进口QuartzCore/QuartzCore.h的话，我没有得到任何错误。所以我敢打赌，进口的作品，但不知道。
解决
我错过了包括QuartzCore框架！
也许不要问这个问题，你可以保留在这里的评论中的回应：http://stackoverflow.com/questions/1142727/how-can-i-animate-the-movement-of-a-沿着弯曲的路径观看或者图像1143095＃1143095 – 2009-07-21 12:54:39
如果你写了一个清晰的问题并且答案很明确，让我告诉你：你的计划失败了！ – 2009-07-21 13:32:16