XCCDButton

简单的带有冷却时间的按钮

用法：

v = [[XCCDButton alloc] initWithFrame:(CGRectMake(100, 100, 100, 100))
                                  bgImage:[UIImage imageNamed:@"button_bg"]
                                maskImage:[UIImage imageNamed:@"button_shadow"]
                                 duration:3];
    [self.view addSubview:v];
    

效果：