UILabel自适应高度

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UILabel *instructions=[[UILabel alloc]initWithFrame:CGRectMake(10, 10, 300, 180)];

NSString *text = @"这是个测试，不信你试试！这是个测试，再不信你copy代码！这是个测试，果然！自适应高度了！";

instructions.text = text;

instructions.lineBreakMode = NSLineBreakByWordWrapping; //这个是关键

instructions.numberOfLines = 0; //这个是关键

[instructions setTextColor:[UIColor grayColor]];

CGSize size = [instructions.text sizeWithFont:[UIFont systemFontOfSize:20.0] constrainedToSize:CGSizeMake(300.0f,CGFLOAT_MAX) lineBreakMode:NSLineBreakByWordWrapping];

CGRect newFrame = instructions.frame;

newFrame.size.height = size.height;

instructions.frame = newFrame;

[instructions sizeToFit];

[self.view addSubview:instructions];