UILabel *lab = [[UILabel alloc] initWithFrame:CGRectMake(20, 100, 300, 20)];
lab.backgroundColor = [UIColor cyanColor];
[self.view addSubview:lab];
lab.text = @"asdfasdfasdfauysdgfkajsgdkfjagksjdhfgkjahsdgfkjahsdgfjhaskdhjfgajksdfagkjhsd";
lab.numberOfLines = 0;
[lab sizeToFit];
NSLog(@"%f",CGRectGetMaxY(lab.frame));
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