第三课 页面内容文字1

 UILabel *contentText = [[UILabel alloc] initWithFrame:CGRectMake(20, 84, [UIScreen mainScreen].bounds.size.width-40, 20)];
    contentText.text = @"向狂想者致敬";
    contentText.textColor = [UIColor blackColor];
    contentText.font = [UIFont systemFontOfSize:15];
    contentText.textAlignment = NSTextAlignmentLeft;
    [self.view addSubview:contentText];