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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

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