NSInvocation 回调使用

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声明

NSInvocation* m_touchDown;

赋值

-(void) setTouchMoveCallback:(id) target sel:(SEL) sel {    if (m_touchMove) {        [m_touchMove release];        m_touchMove = nil;    }    NSMethodSignature *sig= [target methodSignatureForSelector:sel];    NSAssert(sig, @"");    m_touchMove = [NSInvocation invocationWithMethodSignature:sig];    [m_touchMove setTarget:target];    [m_touchMove setSelector:sel];    [m_touchMove setArgument:&self atIndex:2];    [m_touchMove retain];}

开始回调

- (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event{    if (m_touchDown) {        [m_touchDown setArgument:&touch atIndex:3];        [m_touchDown setArgument:&event atIndex:4];        [m_touchDown invoke];    }    return YES;}

使用

[btn setTouchDownCallback:self sel:@selector(eventTouchBegin:touch:event:)];

回调函数

-(void) eventTouchBegin:(myButton*) sender touch:(UITouch*) touch event:(UIEvent*) event {   // TODO}