Question

我想要一个闪烁按钮，然后我这样编码我按下这样的按钮：

_btn = [[UIButton alloc] initWithFrame:CGRectMake(50, 50, 200, 200)];
[_btn addTarget:self action:@selector(test:) forControlEvents:UIControlEventTouchUpInside];
[_btn setBackgroundImage:[UIImage imageNamed:@"img2.jpg"] forState:UIControlStateNormal];

我将这样的动画编码：

[UIView animateWithDuration:1 delay:0 options:UIViewAnimationOptionRepeat|UIViewAnimationOptionAutoreverse animations:^{
    _btn.alpha = 0.2;
} completion:nil];

按钮含糊不清但无法选择，无法接收发件人。任何人都知道为什么它无法接收发件人？

Answer 1

试试这个

[UIView animateWithDuration:1 delay:0 options: UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionRepeat|UIViewAnimationOptionAutoreverse animations:^{
    _btn.alpha = 0.2;
} completion:nil];

我在上面的代码中插入了这个选项

UIViewAnimationOptionAllowUserInteraction

Answer 2

我没有t know why it can收到发件人，可能是因为阿尔法一直在变化。但我有办法解决它。你可以创建一个后台按钮，它可以接收发件人，你可以像这样编码：

    _btn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
    _btn.userInteractionEnabled = NO;
    [_btn setBackgroundImage:[UIImage imageNamed:@"img2.jpg"] forState:UIControlStateNormal];


    _btn1 = [[UIButton alloc] initWithFrame:CGRectMake(50, 50, 200, 200)];
    [_btn1 addTarget:self action:@selector(test:) forControlEvents:UIControlEventTouchUpInside];
    [_btn1 setBackgroundColor:[UIColor clearColor]];
    [_btn1 addSubView : _btn];

然后像代码一样设置动画

[UIView animateWithDuration:1 delay:0 options:UIViewAnimationOptionRepeat|UIViewAnimationOptionAutoreverse animations:^{
    _btn.alpha = 0.2;
} completion:nil];

button1将收到发件人

为什么我的setAlpha动画停止按钮接收发件人？

2 个答案: