在观察事件后删除观察者
我有一个对象观察者，我只需要检测一件事。一旦我完成了它，我想将其删除以消除开销。
所以它看起来像这样：
-(void) observeValueForKeyPath:(NSString*)keyPath ofObject:(id)object change:(NSDictionary*) change context:(void*)context{
if ([keyPath isEqual:@"doingSomething"]){
if ([object isDoingSomething] == NO) {
[my_object setDoingSomething: DO_NOTHING_FOREVER];
[my_object removeObserver:self forKeyPath:@"doingSomething"] // <= ERROR eventually
}
}
}
但这不起作用，并抛出一个错误，如：
NSKVOPendingNotificationRelease“EXC_BAD_ACCESS”
I have an object observer that I only need to detect one thing. Once I'm done with it, I'd like to remove it to eliminate overhead.
So it would look something like this:
-(void) observeValueForKeyPath:(NSString*)keyPath ofObject:(id)object change:(NSDictionary*) change context:(void*)context{
if ([keyPath isEqual:@"doingSomething"]){
if ([object isDoingSomething] == NO) {
[my_object setDoingSomething: DO_NOTHING_FOREVER];
[my_object removeObserver:self forKeyPath:@"doingSomething"] // <= ERROR eventually
}
}
}
This does not work though and throws an error like:
NSKVOPendingNotificationRelease “EXC_BAD_ACCESS”
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评论（1）
您不应该在
对象上调用removeobserver吗？removeObserver:forKeyPath:方法应该在接收器上调用。Shouldn't you be calling remove observer on the
object?removeObserver:forKeyPath:method should be called on the receiver.