UILabel文字大小自适应之－－SizeToFit

UILabel文字大小自适应之－－SizeToFit

在做UIlabel的时候一直苦于没有好的方法来实时控制label的宽度，后来发现iOS自带一个sizeToFit的方法可以根据label里的文字来自动适应尺寸

看下效果图

附上代码

@interface ViewController ()

@property (strong,  nonatomic ) UITextField *textField;
@property (strong,  nonatomic ) UILabel *label;

@end

@implementation ViewController

- ( void )viewDidLoad {
    [ super viewDidLoad];

    //按钮
    UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(60, 50, 200, 40)];
    btn.backgroundColor = [UIColor grayColor];
    [btn setTitle: @"使用SizeToFit" forState:UIControlStateNormal];
    [btn addTarget: self action: @selector (btnEvent) forControlEvents:UIControlEventTouchUpInside];
    [ self .view addSubview:btn];

    //textField
    _textField = [[UITextField alloc] initWithFrame:CGRectMake(60, 100, 200, 30)];
    [[ NSNotificationCenter defaultCenter] addObserver: self selector: @selector (changeTextField) name:UITextFieldTextDidChangeNotification object: nil ];
    _textField.backgroundColor = [UIColor purpleColor];
    [ self .view addSubview:_textField];

    //label
    _label = [[UILabel alloc] initWithFrame:CGRectMake(60, 150, 40, 20)];
    _label.backgroundColor = [UIColor orangeColor];
    [ self .view addSubview:_label];
}

- ( void )btnEvent
{
    [_label sizeToFit];
}

- ( void )changeTextField
{
    _label.text = _textField.text;
}

@end