如何爲UIButton的文本添加換行符？

Question

我想知道如何在UIButton上有多行標籤。

Answer 1

使用的UIButton的titleLabel，具體titleLabel.numberOfLines屬性：

titleLabel 
A view that displays the value of the currentTitle property for a button. (read-only) 

@property(nonatomic,readonly,retain) UILabel *titleLabel 
Discussion 
Although this property is read-only, its own properties are read/write. Use these 
properties to configure the appearance of the button label. For example: 

UIButton *button     = [UIButton buttonWithType: UIButtonTypeRoundedRect]; 
button.titleLabel.font   = [UIFont systemFontOfSize: 12]; 
button.titleLabel.lineBreakMode = UILineBreakModeTailTruncation; 
button.titleLabel.shadowOffset = CGSizeMake (1.0, 0.0); 
The titleLabel property returns a value even if the button has not been displayed yet. 
The value of the property is nil for system buttons.