iOS UIButton 点击无效

Question

我对 iOS UIButton 以编程方式处理点击有疑问。

我有一个UIButton:

- (UIButton *)compareButton
{
    if (!_compareButton)
    {
        NSString *title = TITLE;

        NSDictionary *attributes = TITLE_ATTRIBUTES;

        NSAttributedString *attributedTitle = [[NSAttributedString alloc] initWithString:title attributes:attributes];

        _compareButton = [[UIButton alloc] initWithFrame:CGRectMake(0.0f, 20.0f, 100.0f, 44.0f)];

        _compareButton.backgroundColor = [UIColor redColor];

        [_compareButton setAttributedTitle:attributedTitle forState:UIControlStateNormal];
        [_compareButton addTarget:self action:@selector(buttonCompareClicked:) forControlEvents:UIControlEventTouchUpInside];
    }

    return _compareButton;
}

UIButton点击应该用method

处理

- (void)buttonCompareClicked:(UIButton *)sender

此外，我有一个 UIView:

- (UIView *)header
{
    if (!_header)
    {
        UIView *header = [[UIView alloc] init];

        header.backgroundColor = [UIColor whiteColor];

        [self.view addSubview:header];

        _header = header;
    }

    return _header;
}

我的按钮是一个视图的子视图：

[self.header addSubview:self.compareButton];

已启用所有用户交互：

self.view.userInteractionEnabled = YES;
self.header.userInteractionEnabled = YES;
self.compareButton.userInteractionEnabled = YES;

尽管如此，单击按钮不会触发方法调用。

这可能哪里有问题？

Answer 1

请试试这个。

[self.header addSubview:[self compareButton]];

希望对您有所帮助.....

Answer 2

    //Better to Use Below lines
    _comparebutton=[UIButton buttonwithtype:UIButtontyperoundrect];
    [_comparebutton setframe:CGRectMake(0.0f, 20.0f, 100.0f, 44.0f)];
    //instead of
    //_compareButton = [[UIButton alloc] initWithFrame:CGRectMake(0.0f, 20.0f, 100.0f, 44.0f)];

Answer 3

1-您需要设置 header 视图的框架：

UIView *header = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 20.0f, 100.0f, 44.0f)];

2-所以在这种情况下，将按钮的框架设置为相对于 header 视图：

_compareButton = [[UIButton alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 100.0f, 44.0f)];

3-不要忘记将 compareButton 属性设置为强：

@property (nonatomic, strong) UIButton *compareButton;

Answer 4

我认为问题出在 self.header。您需要为其设置框架。

self.header.frame = CGRectMake(0, 0, 320, 80);

在此之后你的按钮应该开始注册触摸。

为什么？

好问题。

由于您 self.header 的层有属性 maskToBounds 默认设置为否，因此您在 header 视图中添加的任何视图都将可见。但是由于您的 header 视图没有可点击的区域，因此任何 subviews 都无法点击。这就是为什么你的按钮没有注册触摸。

Answer 5

修改你的代码如下

- (UIView *)header
{
    if (!_header)
    {
        UIView *header = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 100.0f, 44.0f)];

        header.backgroundColor = [UIColor whiteColor];

        [header addSubView:[self compareButton]];//add this line of code

        [self.view addSubview:header];

        _header = header;
    }

    return _header;
}

//修改

- (UIButton *)compareButton
{
    if (!_compareButton)
    {
        NSString *title = TITLE;

        NSDictionary *attributes = TITLE_ATTRIBUTES;

        NSAttributedString *attributedTitle = [[NSAttributedString alloc] initWithString:title attributes:attributes];

      _compareButton=[UIButton buttonWithType:UIButtonTypeCustom];//modified
      _compareButton.frame=CGRectMake(0.0f, 20.0f, 100.0f, 44.0f);//modified

        _compareButton.backgroundColor = [UIColor redColor];

        [_compareButton setAttributedTitle:attributedTitle forState:UIControlStateNormal];
        [_compareButton addTarget:self action:@selector(buttonCompareClicked:) forControlEvents:UIControlEventTouchUpInside];
    }

    return _compareButton;
}

-(IBAction)buttonCompareClicked:(id)sender
{
    NSLog(@"@@@@@@@@@Button Compare Called@@@@@@@");
}

希望它能解决问题......！

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