Question

在我的UIView子类中（我已在Interface Builder中实例化），有一些按钮作为子视图，我在initWithCoder方法中添加到我的视图中，如下所示：

theButton = [UIButton buttonWithType:UIButtonTypeCustom];
            [theButton setFrame:CGRectMake([UIScreen mainScreen].bounds.size.height-150-10, 289, 150, 21)];
            [theButton.titleLabel setTextAlignment:UITextAlignmentRight];
            [theButton setOpaque:YES];
            [theButton.titleLabel setFont:[UIFont fontWithName:@"MyFont" size:32.0]];
            [theButton.titleLabel setTextColor:[UIColor redColor]];
            [theButton.titleLabel setText:@"text"];
            [self addSubview:theButton];
            [theButton addTarget:myTarget action:@selector(pause) forControlEvents:UIControlEventTouchUpInside];

但按钮不会按照预期绘制。如果我在drawRect:和po [self subviews]中使用llvm设置断点，我会得到此输出。

$0 = 0x0c93e860 <__NSArrayM 0xc93e860>(
<UIButton: 0xc93d910; frame = (10 289; 150 21); alpha = 0.5; layer = <CALayer: 0xc93d4a0>>,
<UIButton: 0xc93e2d0; frame = (408 289; 150 21); layer = <CALayer: 0xc93e390>>
)

那么为什么我的按钮不显示？

编辑：我的superview的recursiveDescription：

<UIView: 0xa46b220; frame = (0 0; 320 568); transform = [0, -1, 1, 0, 0, 0]; autoresize = RM+BM; layer = <CALayer: 0xa46b280>>
   | <MyView: 0xa168710; frame = (0 0; 568 320); autoresize = W+H; layer = <CALayer: 0xa1687d0>>
   |    | <UIButton: 0xa16c160; frame = (10 289; 150 21); alpha = 0.5; layer = <CALayer: 0xa16bcc0>>
   |    |    | <UIButtonLabel: 0xa16c3e0; frame = (0 0; 0 0); clipsToBounds = YES; hidden = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0xa16c480>>
   |    | <UIButton: 0xa16cb00; frame = (408 289; 150 21); layer = <CALayer: 0xa16cbc0>>
   |    |    | <UIButtonLabel: 0xa16c7e0; frame = (0 0; 0 0); clipsToBounds = YES; hidden = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0xa16c880>>

Answer 1

嗯，我的猜测是你的按钮出现了，但你把它变成了一个没有正常状态文本的自定义按钮（因为你没有使用任何背景图像或颜色，它似乎看不见）。

UIButton* button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setTitle:@"Text" forState:UIControlStateNormal];

Answer 2

不要在按钮的标签上调用setText，而是尝试将setTitle:forState发送到按钮（而不是其标题标签）：

[theButton setTitle:@"text" forState:UIControlStateNormal]

UIView子视图没有显示出来

2 个答案: