无法在 ObjC 中设置对象？
每当我的方法将一个对象设置为 onTouchEventReceiver 时，当另一个线程调用另一个方法时，该对象就会丢失。
//In header
id onTouchEventReceiver;
SEL onTouchSelector;
- (void) setOnTouchSelector:(SEL)sel withObject:(id)obj
{
NSLog(@"setting obj to %@",obj);
onTouchSelector = sel;
[self setOnTouchEventReceiver:obj];
NSLog(@"====----- %@",onTouchEventReceiver); //That works
}
//Another thread calls this
- (void) touchEventReceived
{
NSLog(@"firing a selector at %@ by %@",onTouchEventReceiver,self);
//Why on earth does that happen?????
if (onTouchEventReceiver != nil) //onTouchEventReceiver is (null)
{
[onTouchEventReceiver performSelector:onTouchSelector];
}
}
代码产生以下结果：
2010-07-18 23:40:54.776 app[737:903] setting obj to <appCtl: 0x10fa00>
2010-07-18 23:40:54.787 app[737:903] ====----- <appCtl: 0x10fa00>
...触摸屏幕后...
Got touch event at coordinates 154 x 243 , mask : 2
2010-07-18 23:41:39.342 app[737:3b03] AALayer hit test passed : <AALayer: 0x110af0>
2010-07-18 23:41:39.348 app[737:3b03] firing a selector at (null) by <AALayer: 0x110af0>
为什么会发生这种情况？代码似乎是正确的。
Whenever my method sets an object to onTouchEventReceiver, it gets lost when another method is called by another thread.
//In header
id onTouchEventReceiver;
SEL onTouchSelector;
- (void) setOnTouchSelector:(SEL)sel withObject:(id)obj
{
NSLog(@"setting obj to %@",obj);
onTouchSelector = sel;
[self setOnTouchEventReceiver:obj];
NSLog(@"====----- %@",onTouchEventReceiver); //That works
}
//Another thread calls this
- (void) touchEventReceived
{
NSLog(@"firing a selector at %@ by %@",onTouchEventReceiver,self);
//Why on earth does that happen?????
if (onTouchEventReceiver != nil) //onTouchEventReceiver is (null)
{
[onTouchEventReceiver performSelector:onTouchSelector];
}
}
The code produces the following:
2010-07-18 23:40:54.776 app[737:903] setting obj to <appCtl: 0x10fa00>
2010-07-18 23:40:54.787 app[737:903] ====----- <appCtl: 0x10fa00>
... after the screen was touched ...
Got touch event at coordinates 154 x 243 , mask : 2
2010-07-18 23:41:39.342 app[737:3b03] AALayer hit test passed : <AALayer: 0x110af0>
2010-07-18 23:41:39.348 app[737:3b03] firing a selector at (null) by <AALayer: 0x110af0>
Why does that happen? The code seems to be correct .
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您的日志消息中的
AALayer让我认为它可能是CALayer的子类。如果是这种情况，那么您可能很容易拥有两个独立的对象。 CALayer 被复制以供渲染机器呈现。如果这是问题所在，您需要子类-initWithLayer:以适当地复制额外的 ivars。The
AALayerin your log message makes me think that it might be a subclass ofCALayer. If this is the case, then you might easily have two separate objects.CALayers get duplicated for presentation by the rendering machinery. If this is the problem, you need to subclass-initWithLayer:to copy your extra ivars appropriately.我想你忘记了@property。您可以：
1/ 显示属性代码
2/ 将此行更改为：
NSLog(@"====----- %@",onTouchEventReceiver); //这有效到NSLog(@"====----- %@", [self getOnTouchEventReceiver]);//这有效I think yo forgot the @property. Can you :
1/ Show me the property code
2/ Change this line to :
NSLog(@"====----- %@",onTouchEventReceiver); //That workstoNSLog(@"====----- %@", [self getOnTouchEventReceiver]);//That works