UILabel自适应文字大小

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UILabel *_lab = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];

[_lab setText:msgStr];

//设置自动行数与字符换行

[_lab setNumberOfLines:0];

_lab.lineBreakMode = NSLineBreakByWordWrapping;

// 背景颜色

_lab.backgroundColor = [UIColor colorWithRed:32.0/255.0 green:90.0/255.0 blue:167.0/255.0 alpha:0.9];

_lab.textColor = [UIColor whiteColor];

//设置一个行高上限

CGSize size = CGSizeMake(320,2000);

_lab.font = [UIFont fontWithName:@"Helvetica" size:16.0];

_lab.adjustsFontSizeToFitWidth = YES;

CGSize labelsize = [msgStr sizeWithFont:_lab.font constrainedToSize:size lineBreakMode:NSLineBreakByWordWrapping];

_lab.frame = CGRectMake((320-labelsize.width)/2, 320, labelsize.width, labelsize.height);

self.lab = _lab;

[self performSelector:@selector(dismisslab) withObject:nil afterDelay:2.0f];

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