ios - UIButton addTarget 不起作用

Question

视图控制器：

@implementation PaiLifeViewController
@synthesize detail = _detail;
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    UIImage *i = [UIImage imageNamed:@"menu_patcode_normal"];
    UIButton *c1 = [[UIButton alloc] init];
    c1.tag = 11;
    UIButton *c2 = [[UIButton alloc] init];
    c2.tag = 12;
    UIButton *c3 = [[UIButton alloc] init];
    c3.tag = 13;
    UIButton *c4 = [[UIButton alloc] init];
    c4.tag = 21;
    UIButton *c5 = [[UIButton alloc] init];
    c5.tag = 22;
    UIButton *c6 = [[UIButton alloc] init];
    c6.tag = 23;
    UIButton *c7 = [[UIButton alloc] init];
    c7.tag = 31;
    UIButton *c8 = [[UIButton alloc] init];
    c8.tag = 32;
    UIButton *c9 = [[UIButton alloc] init];
    c9.tag = 33;

    [c1 setBackgroundImage:i forState:UIControlStateNormal];
    [c2 setBackgroundImage:i forState:UIControlStateNormal];
    [c3 setBackgroundImage:i forState:UIControlStateNormal];
    [c4 setBackgroundImage:i forState:UIControlStateNormal];
    [c5 setBackgroundImage:i forState:UIControlStateNormal];
    [c6 setBackgroundImage:i forState:UIControlStateNormal];
    [c7 setBackgroundImage:i forState:UIControlStateNormal];
    [c8 setBackgroundImage:i forState:UIControlStateNormal];
    [c9 setBackgroundImage:i forState:UIControlStateNormal];

    NSArray *c = [[NSArray alloc] initWithObjects:c1,c2,c3,c4,c5,c6,c7,c8,c9, nil];
    _detail= [[PaiLifePageDetail alloc] initWithDataSource:c pageIndex:1];
    for (UIButton *b in c)
    {
        [b addTarget:self action:@selector(clicked:) forControlEvents:UIControlEventTouchUpInside];
    }
    [self.view addSubview:_detail];
}

- (void) clicked : (UIButton *) button
{
    NSLog(@"button = %i", button.tag);
}

@end

自定义视图：

@implementation PaiLifePageDetail
#define MARGINTOTOP 120.0
#define MARGINTOLEFT 20.0
#define WIDTH 80.0
#define HEIGHT 60.0

- (id) initWithDataSource : (NSArray *) dataSource pageIndex : (int) pageIndex;
{
    self = [super init];
    if (self)
    {
        if (dataSource)
        {
            for (UIButton *button in dataSource)
            {
                //page 1 line 1
                if (pageIndex == 1)
                {
                    if (button.tag == 11)
                    {
                        button.frame = CGRectMake(MARGINTOLEFT, MARGINTOTOP, WIDTH * 2 + 20, HEIGHT);
                        [self addSubview:button];
                    }
                    else if (button.tag == 12)
                    {
                        button.frame = CGRectMake(MARGINTOLEFT + WIDTH * 2 + 20 * 2, MARGINTOTOP, WIDTH, HEIGHT);
                        [self addSubview:button];
                    }
                }
                //not page 1 line 1
                else
                {
                    if ( button.tag == 11 )
                    {
                        button.frame = CGRectMake(MARGINTOLEFT, MARGINTOTOP, WIDTH, HEIGHT);
                        [self addSubview:button];
                    }
                    else if ( button.tag == 12 )
                    {
                        button.frame = CGRectMake(MARGINTOLEFT + WIDTH + 20, MARGINTOTOP, WIDTH, HEIGHT);
                        [self addSubview:button];
                    }
                    else if ( button.tag == 13 )
                    {
                        button.frame = CGRectMake(MARGINTOLEFT + (WIDTH + 20) * 2, MARGINTOTOP, WIDTH, HEIGHT);
                        [self addSubview:button];
                    }
                }

                // line 2
                if ( button.tag == 21 )
                {
                    button.frame = CGRectMake(MARGINTOLEFT, MARGINTOTOP + HEIGHT + 20, WIDTH, HEIGHT);
                    [self addSubview:button];
                }
                else if ( button.tag == 22 )
                {
                    button.frame = CGRectMake(MARGINTOLEFT + WIDTH + 20, MARGINTOTOP + HEIGHT + 20, WIDTH, HEIGHT);
                    [self addSubview:button];
                }
                else if ( button.tag == 23 )
                {
                    button.frame = CGRectMake(MARGINTOLEFT + (WIDTH + 20) * 2, MARGINTOTOP + HEIGHT + 20, WIDTH, HEIGHT);
                    [self addSubview:button];
                }

                // line 3
                if ( button.tag == 31 )
                {
                    button.frame = CGRectMake(MARGINTOLEFT, MARGINTOTOP + (HEIGHT + 20) * 2, WIDTH, HEIGHT);
                    [self addSubview:button];
                }
                else if ( button.tag == 32 )
                {
                    button.frame = CGRectMake(MARGINTOLEFT + WIDTH + 20, MARGINTOTOP + (HEIGHT + 20) * 2, WIDTH, HEIGHT);
                    [self addSubview:button];
                }
                else if ( button.tag == 33 )
                {
                    button.frame = CGRectMake(MARGINTOLEFT + (WIDTH + 20) * 2, MARGINTOTOP + (HEIGHT + 20) * 2, WIDTH, HEIGHT);
                    [self addSubview:button];
                }
            }
        }
    }
    return self;
}

@end

但是当我点击这些按钮时，它们根本不起作用，请帮我解决这个问题，非常感谢。

Answer 1

这可能是一个触摸处理事件问题。即触摸永远不会到达您的自定义按钮。要调试这个：

1. 你的按钮的子类是什么？
2. 检查 userInterction 是否启用？
3. 检查您对按钮的超级视图UIGestureRecognizer- 它们可能会干扰触摸处理。
4. 你是 clipsToBounds 属性 NO 吗？如果是这样，触摸是否超出了视图的范围？
5. 覆盖自定义按钮中的 touchesBegan 以查看它是否被调用。

Answer 2

I had the same issue when I already had button below the superview of my button, for which I wanted to add target. I have changed the frame of my button., then the problem was solved

Answer 3

方法：(id)initWithFrame:(CGRect)frame不用于创建那些 PaiLifeCustomButton 类型的按钮。

或者在调用init之后手动设置一个frame。我没有仔细研究你的代码，但一切看起来都很好。设置断点以查看您的代码是否运行。

Answer 4

我有同样的问题，问题是我的视图是用 init 而不是 initWithFrame 创建的。万一有人有同样的问题，那么它可能会对你有所帮助。