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7年前关闭。
我将项目转换为ARC。 Xcode在示例代码中更改了这一行
soundFileURLRef = (CFURLRef) [tapSound retain];
至
soundFileURLRef = (__bridge CFURLRef) tapSound;
但没有声音播放。怎么了？
- (IBAction)buttonTapped:(UIButton *)sender {
// Create the URL for the source audio file. The URLForResource:withExtension: method is new in iOS 4.0
NSURL *tapSound = [[NSBundle mainBundle] URLForResource: @"abide" withExtension: @"aif"];
CFURLRef soundFileURLRef;
SystemSoundID soundFileObject;
// Store the URL as a CFURLRef instance
soundFileURLRef = (__bridge CFURLRef) tapSound; // I think this line is wrong
// Create a system sound object representing the sound file.
AudioServicesCreateSystemSoundID (
soundFileURLRef,
&soundFileObject
);
AudioServicesPlaySystemSound (soundFileObject);
}
从逻辑上讲，您的代码看起来完全正常。我怀疑您实际上并未将abide.aif与您的应用程序 bundle 在一起，或者您不小心键入了错误的名称(扩展名为aiff吗？)。您可以通过在[NSBundle URLForResource:withExtension:]调用之后放置一个断点并检查tapSound的内容来验证这一点。
确保您已将其实际包含在“复制 bundle 包资源”中作为目标:
另外，您应该意识到对AudioServicesCreateSystemSoundID的调用应与AudioServicesDisposeSystemSoundID调用保持平衡。您在这里不必要地分配内存，ARC不会为您处理此事。
理想的方法是完成所有工作，以便在SystemSoundID或awakeFromNib方法中创建viewDidLoad，将其存储为ivar，然后仅在按钮tap方法中调用AudioServicesPlaySystemSound。在您的dealloc方法中，应该调用AudioServicesDisposeSystemSoundID。
让我知道事情的后续。