由于某种原因，Xcode 告诉我，当我使用 kCAFillModeForwards 之类的东西时，它找不到符号。我必须包含一个库或类......但是是哪一个呢？正常的核心动画工作正常，如 [myView beginAnimations...]。让更复杂的动画作品发挥作用的技巧是什么？
我已包含在 .h 文件中:
#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>
@interface TestClass : UIView {
}
// ...
我运行这段代码:
- (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
}
这种情况发生在我构建时(确实清理了很多次)，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:
literal-pointer@__OBJC@__cls_refs@CABasicAnimation in TestClassTestClass.o
"_kCAFillModeForwards", referenced from:
_kCAFillModeForwards$non_lazy_ptr in TestClass.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
".objc_class_name_CABasicAnimation", referenced from:
literal-pointer@__OBJC@__cls_refs@CABasicAnimation in TestClass.o
"_kCAFillModeForwards", referenced from:
_kCAFillModeForwards$non_lazy_ptr in TestClass.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
它说 undefined symbol :
我必须包含一些框架吗？
我已经包含了:
CoreGraphics.framework 基础框架 UIKit.framework
当我删除所有代码，但导入 QuartzCore/QuartzCore.h 时，我不会收到任何错误。所以我打赌导入有效，但不确定。
已解决
我错过了包含 QuartzCore 框架!!
最佳答案
您是否在 header 中导入 quartz ？
#import <QuartzCore/QuartzCore.h>
QuartzCore 包含 CAAnimation header
关于iphone - 为什么我无法执行任何 CABasicAnimation 或关键帧动画内容？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/1158956/