ios - 文本在圆形 UIButton iOS 中不可见

Question

我正在添加一个圆形的 UIButton，如下所示:

-(void)addInfoButton
{
    UIButton *pButton = [UIButton buttonWithType:UIButtonTypeCustom];

    [pButton addTarget:self
                action:@selector(infoButtonDidTap:)
      forControlEvents:UIControlEventTouchUpInside];

    pButton.frame = [self getInfoButtonFrame];

    pButton.clipsToBounds = NO;

    //half of the width
    pButton.layer.cornerRadius = BUTTON_HEIGHT/2.0f;
    pButton.layer.borderColor = self.tintColor.CGColor;
    pButton.layer.borderWidth = 2.0f;

    pButton.titleLabel.text = @"F";

    pButton.titleLabel.textColor = self.tintColor;
    pButton.titleLabel.textAlignment = NSTextAlignmentCenter;

    self.filterInfoButton = pButton;

    [self addSubview:pButton];
}

显示按钮时，文本“F”不可见。可能是什么原因？

编辑:将角半径设置为 0 时，文本可见。但是，按钮不是圆形的。

Answer 1

您可以使用

设置 UIButton 的标题

- setTitle:forState:

Sets the title to use for the specified state.

使用属性 titleLabel 不会设置用于自定义按钮标题标签的文本。

titleLabel 

A view that displays the value of the currentTitle property for a button. (read-only) Although this property is read-only, its own properties are read/write. Use these properties primarily to configure the text of the button. For example:

button.titleLabel.font = UIFont.systemFontOfSize(12)