UIButton 选择器方法不起作用

Posted 2023-03-13

【中文标题】UIButton 选择器方法不起作用

【英文标题】：UIButton Selector method not working

【发布时间】：2016-06-16 07:15:49

【问题描述】：

我以编程方式创建 UIIimageView，而不是创建 UIView，在 uiview 中，我以编程方式添加了两个 uibutton，但按钮选择器方法不起作用。我尝试了很多东西，但什么也没发生。这是我的代码

-(void) pagingFunc
    CGRect screen = [[UIScreen mainScreen] bounds];
    CGFloat width = CGRectGetWidth(screen);
    CGFloat height = CGRectGetHeight(screen);



    //ScrollView Size and Contents
    CGSize mxSize = CGSizeMake( [imgesArry count]*width , height-114);
    [scrlView setContentSize : mxSize];

     self.customView.translatesAutoresizingMaskIntoConstraints =YES;
    self.customView.frame = CGRectMake(0, 0, mxSize.width, mxSize.height);


    int incX = 0 ;

    for( int i = 0; i < [imgesArry count]; i++)
    
        PFObject *imageObject = [imgesArry objectAtIndex:i];
        PFFile *file;
        if (height == 480) 
            file = [imageObject objectForKey:@"image4s"];
        
        else
            file = [imageObject objectForKey:@"image6s"];
        

    NSString * imgFile = [file  url];
     UIImageView*  imagView = [[UIImageView alloc]initWithFrame : CGRectMake(incX,0,width ,height)];
        imgView.userInteractionEnabled = YES;
        [imagView sd_setImageWithURL:[NSURL URLWithString:imgFile] placeholderImage:[UIImage imageNamed:@"UserUpdationImageCell.png"]];
        btnView  = [[UIView alloc] initWithFrame:CGRectMake(incX, imagView.frame.size.height-60, width, 50)];
        btnView.backgroundColor = [UIColor colorWithRed:0/255.0 green:0/255.0 blue:0/255.0 alpha:0.8];
        UIButton *bckBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        [bckBtn addTarget:self
                   action:@selector(aMethod)
         forControlEvents:UIControlEventTouchUpInside];
        [bckBtn setTitle:@"Back" forState:UIControlStateNormal];
        bckBtn.frame = CGRectMake(0 ,0, 160.0, 40.0);


        UIButton *downloadBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        [downloadBtn addTarget:self
                   action:@selector(aMethod)
         forControlEvents:UIControlEventTouchUpInside];
        [downloadBtn setTitle:@"Download" forState:UIControlStateNormal];
        downloadBtn.frame = CGRectMake(160 ,0, 160.0, 40.0);
        [btnView addSubview:bckBtn];
        [btnView addSubview:downloadBtn];
        [self.customView addSubview:imagView];
        [self.customView addSubview:btnView];


        incX+= width;
    
    [scrlView setContentOffset:CGPointMake(width*selectedIndex, 0)];

【问题讨论】：

我也面临同样的问题，这是因为，UIButton 不知何故失去了它的目标。使用 UIButton+Block 类别，这对我有帮助。这是链接gist.github.com/joshdholtz/2468899

设置btnView.userInteractionEnabled=YES;

现在尝试链接@Mahesh

我之前尝试过，但“启用用户交互”不起作用@Paulw11

还有self.customView ？ - 需要在所有超级视图上启用用户交互

【参考方案1】：

你可以设置：self.customView.userInteractionEnabled=YES;

我写了一个你描述的简单演示，它可以工作：

// imagView -> view1 -> bckBtn
    UIImageView *imagView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 200, 200)];
    imagView.userInteractionEnabled = YES;
    imagView.backgroundColor = [UIColor grayColor];
    [self.view addSubview:imagView];

    UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(50, 50, 100, 100)];
    view1.backgroundColor = [UIColor yellowColor];
    [imagView addSubview:view1];

    UIButton *bckBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    bckBtn.frame = CGRectMake(10, 10, 50, 50);
    bckBtn.backgroundColor = [UIColor redColor];
    [bckBtn addTarget:self
               action:@selector(aMethod)
     forControlEvents:UIControlEventTouchUpInside];
    [bckBtn setTitle:@"Back" forState:UIControlStateNormal];
    [view1 addSubview:bckBtn];

-(void)aMethod
    NSLog(@"button click");

希望对你有帮助。

【参考方案2】：

第一件事，确保你没有任何覆盖按钮。 您也可以尝试使用 GestureRecognizers。

这是一个Swift sn-p，我很确定它可以翻译成obj-c

let xButton = UIButton(frame: CGRect(x: 0, y: 0, width: 160, height: 40))
xButton.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(aMethod)))