UILabel基本用法

 1 UILabel *_label = [[UILabel alloc]initWithFrame:CGRectMake(20,  self.view.frame.size.height*0.5f, self.view.frame.size.width*0.5f, 40)];  2 _label.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.6];  3 _label.textColor = [UIColor whiteColor];  4 _label.layer.cornerRadius = 5;  5 _label.layer.masksToBounds= YES;  6 _label .font = [UIFont systemFontOfSize:13];  7 _label .numberOfLines = 2;  8 _label .textAlignment = UITextAlignmentCenter;  9 _label.text = @"輕觸"; 10 [self.view addSubview:_label];