ios 中字符串怎么换行

//对就这么简单 \n NSMutableAttributedString 就可以搞的定

NSString * string =@"你要放在label里的文本字符串\n换行符本字符串本字符串本字符串本字符串本字符串本字符串";
NSMutableAttributedString *attrString =
[[NSMutableAttributedString alloc] initWithString:string];

UILabel *label = [UILabel newAutoLayoutView];
[label autoSetDimension:ALDimensionWidth toSize:300];
label.numberOfLines = 0;
[self.view addSubview:label];
[label autoCenterInSuperview];
label.attributedText =attrString;
label.textAlignment =NSTextAlignmentCenter;