一,效果图。
二,代码。
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
//根据内容自动调整高度
NSString *str = @"公元前3000年,印度河流域的居民的数字使用就已经比较普遍,居民们采用了十进位制的计算法。";
UIFont *font = [UIFont systemFontOfSize:13];
CGSize size = CGSizeMake(200,2000);
CGRect labelRect = [str boundingRectWithSize:size options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading) attributes:[NSDictionary dictionaryWithObject:font forKey:NSFontAttributeName] context:nil];
//UILabel
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(50,100, labelRect.size.width, labelRect.size.height)];
label.text = str;
label.backgroundColor=[UIColor redColor];
label.font = [UIFont systemFontOfSize:13];
label.numberOfLines=0;
[self.view addSubview: label];
}