UILabel 动态高度计算

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CGSize maxSize = CGSizeMake(self.label.frame.size.width, MAXFLOAT);
CGRect labelRect = [self.label.text boundingRectWithSize:maxSize
                                                 options:NSStringDrawingUsesLineFragmentOrigin
                                              attributes:@{NSFontAttributeName:self.label.font} 
                                                 context:nil];
NSLog(@"size %@", NSStringFromCGSize(labelRect.size));

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