iOS - UIButton折行文字顯示設置

首先在控制器中創建一個button

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UIButton * button = [[UIButton alloc] initWithFrame:CGRectMake(20, 30, 35, 50)];
    [self.view addSubview:button];
    [button setTitle:@"button" forState:UIControlStateNormal];
    [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    
    /*
     NSLineBreakByWordWrapping = 0,     	// Wrap at word boundaries, default
     NSLineBreakByCharWrapping,		// Wrap at character boundaries
     NSLineBreakByClipping,		// Simply clip 裁剪從前面到后面顯示多余的直接裁剪掉
     
         文字過長 button寬度不夠時: 省略號顯示位置...
     NSLineBreakByTruncatingHead,	// Truncate at head of line: "...wxyz" 前面顯示
     NSLineBreakByTruncatingTail,	// Truncate at tail of line: "abcd..." 后面顯示
     NSLineBreakByTruncatingMiddle	// Truncate middle of line:  "ab...yz" 中間顯示省略號
     */
    button.titleLabel.lineBreakMode = NSLineBreakByWordWrapping;
    // you probably want to center it
    button.titleLabel.textAlignment = NSTextAlignmentCenter; // if you want to
    [button setTitle: @"Line1\nLine2" forState: UIControlStateNormal];
    button.layer.borderColor = [UIColor blackColor].CGColor;
    button.layer.borderWidth = 1.0;
}

• 此處寬度故意設置的比較小由於文字過長,則設置button.titleLabel.lineBreakMode的屬性為NSLineBreakByTruncatingHead時,此時button的title顯示效果如下
  

• 顯示的前端省略而且只顯示了內容line1,line2被省略掉,當把\n換行符去掉時,則line2不會被省略.
  

• 此處寬度故意設置的比較小由於文字過長,則設置button.titleLabel.lineBreakMode的屬性為NSLineBreakByTruncatingTail時,此時button的title顯示效果如下
  

• 省略號在后面

• 此處寬度故意設置的比較小由於文字過長,則設置button.titleLabel.lineBreakMode的屬性為NSLineBreakByTruncatingMiddle時,此時button的title顯示效果如下
  

• 省略號在中間

• 此處寬度故意設置的比較小由於文字過長,則設置button.titleLabel.lineBreakMode的屬性為NSLineBreakByClipping時,此時button的title顯示效果如下
  

• 超長部分被裁剪掉

把寬度設置寬一些讓button的文字title折行顯示

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UIButton * button = [[UIButton alloc] initWithFrame:CGRectMake(20, 30, 50, 50)];
    [self.view addSubview:button];
    [button setTitle:@"button" forState:UIControlStateNormal];
    [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    
    /*
     NSLineBreakByWordWrapping = 0,     	// Wrap at word boundaries, default
     NSLineBreakByCharWrapping,		// Wrap at character boundaries
     NSLineBreakByClipping,		// Simply clip 裁剪從前面到后面顯示多余的直接裁剪掉
     
         文字過長 button寬度不夠時: 省略號顯示位置...
     NSLineBreakByTruncatingHead,	// Truncate at head of line: "...wxyz" 前面顯示
     NSLineBreakByTruncatingTail,	// Truncate at tail of line: "abcd..." 后面顯示
     NSLineBreakByTruncatingMiddle	// Truncate middle of line:  "ab...yz" 中間顯示省略號
     */
    button.titleLabel.lineBreakMode = NSLineBreakByWordWrapping;
    // you probably want to center it
    button.titleLabel.textAlignment = NSTextAlignmentCenter; // if you want to
    [button setTitle: @"Line1\nLine2" forState: UIControlStateNormal];
    button.layer.borderColor = [UIColor blackColor].CGColor;
    button.layer.borderWidth = 1.0;
}

• 效果如下