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出於某種原因，Xcode告訴我，只要我使用類似kCAFillModeForwards的東西，它就不會找到符號。必須有一個圖書館或班級，我必須包括......但哪一個？正常的核心動畫的東西很好，像[myView beginAnimations ...]。讓更復雜的動畫工作起作用有什麼竅門？爲什麼我不能做任何CABasicAnimation或關鍵幀動畫？
我已經包括在.h文件：
#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>
@interface TestClass : UIView {
}
// ...
我運行此代碼：
- (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
}
這發生在我建（做清理很多次），2個錯誤：
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
它說未定義的符號：
我必須包含一些框架嗎？
我已經包括：
CoreGraphics.framework Foundation.framework UIKit.framework
當我刪除所有代碼，但進口QuartzCore/QuartzCore.h的話，我沒有得到任何錯誤。所以我敢打賭，進口的作品，但不知道。
解決
我錯過了包括QuartzCore框架！
也許不要問這個問題，你可以保留在這裏的評論中的迴應：http://stackoverflow.com/questions/1142727/how-can-i-animate-the-movement-of-a-沿着彎曲的路徑觀看或者圖像1143095＃1143095 – 2009-07-21 12:54:39
如果你寫了一個清晰的問題並且答案很明確，讓我告訴你：你的計劃失敗了！ – 2009-07-21 13:32:16