将子视图添加到UIView后，按钮无法单击

Question

I have created a class called UICustomButton , which is a subclass of UIView . I added a UIButton to UIView as a subview as shown in my code below:

-(id)initWithButtonType:(NSString *)type
{
    self = [super init];
    if (self) 
    {
        self.customButton = [self setupButtonWithTitle:type andFrame:frame];
        [self addSubview:self.customButton];
        self.customButton addTarget:self action:@selector(buttonPressed) forControlEvents:UIControlEventTouchUpInside];

    }
    return self;
}

The problem I am facing is that although the button appears, they are not clickable. Is there something wrong with the way I am adding the buttons to the UIView ?

EDIT: To add on, I am using this custom button class instance to a cell:

UICustomButton *customButton = [[UICustomButton alloc]initWithFrame:someFrame];
[cell.contentView addSubView:customButton];

Answer 1

检查UICustomButton对象的框架，以及self.customButton是否超出其superView 。

Answer 2

Make sure that the frame of the subview is within the frame of its superview. I encountered the issue twice and both times the frame of the subview was incorrect.

Answer 3

My button was not working because i had two views in each other. The first view, as you can see, has a width and heigth of 0 pixels. I've made this view the same size as view2 and then my button was clickable.

    UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(325, 346, 0, 0)];
    view1.alpha = 0.90;

    UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 450, 150)];
    [view2.layer setCornerRadius:10.0f];
    view2.backgroundColor = [UIColor whiteColor];

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [btn addTarget:self action:@selector(addClosedToCollection) forControlEvents:UIControlEventTouchUpInside];
    [btn setFrame:CGRectMake(30, 30, 300, 32)];
    [btn setTitle:@"i'm a button" forState:UIControlStateNormal];

    [view2 addSubview:btn];
    [view1 addSubview:view2];

i hope i've helped somebody out :)

Answer 4

您的外部视图的高度可能为0.添加约束使其与子视图的高度相同（或高于），或者使用足够大的框架创建约束。

Answer 5

You should check if all properties userInteractionEnabled are on:

1. Check that property for UITableView where your cells with this view are displayed
2. Check that property for UITableViewCell where you add this view as subview
3. Check that property for UICustomButton
4. Check that property for customButton in -(id)initWithButtonType:(NSString *)type

Answer 6

尝试把它放在if语句之后：

self.isTouchEnabled = YES;