代理設(shè)計(jì)模式

/**
 *代理設(shè)計(jì)模式的思想: (只是用代理設(shè)計(jì)模式)
 
 對于當(dāng)前視圖對象,只負(fù)責(zé)接收觸摸事件,當(dāng)觸摸事件發(fā)生之后,通知代理做響應(yīng)處理,代理如何來處理,視圖不關(guān)心

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    //如果代理實(shí)現(xiàn)了對應(yīng)的協(xié)議方法,就去調(diào)用, 如果沒有實(shí)現(xiàn)就不要調(diào)用了.
    
    //判斷代理是否實(shí)現(xiàn)的對應(yīng)的方法(判斷一個對象是否實(shí)現(xiàn)了某個方法)
    if ([self.delegate respondsToSelector:@selector(touchViewTouchesBegan:)]) {
        [self.delegate touchViewTouchesBegan:self];
    }
    //觸摸開始時,通知代理做相應(yīng)操作
    

}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
        //觸摸移動時(做移動操作),通知代理做相應(yīng)操作
    if ([self respondsToSelector:@selector(touchViewTouchesMoved:)]) {
            [self.delegate touchViewTouchesMoved:self];
    }


}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
        //觸摸結(jié)束時,通知代理做相應(yīng)操作
    if ([self respondsToSelector:@selector(touchViewTouchesEnded:)]) {
        [self.delegate touchViewTouchesEnded:self];
    }
    
}

 - (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
        //觸摸中斷時,通知代理做相應(yīng)操作
    if ([self respondsToSelector:@selector(touchViewTouchesCancelled:)]) {
        [self.delegate touchViewTouchesCancelled:self];
    }
    
}