iOS Method for Setting Line Spacing of UILabel and Adapting Height

Examples are as follows:

NSString *contentStr = @" Always thought , In the original place , Have 1 The original me , There will be 1 The original you "; 
   
  UILabel *tempLabel = [[UILabel alloc] init]; 
  // Set the background color  
  tempLabel.backgroundColor = [UIColor redColor]; 
  // Setting content  
  tempLabel.text = contentStr; 
  // Set the font color  
  tempLabel.textColor = [UIColor whiteColor]; 
  // Set the font size  
  tempLabel.font = [UIFont systemFontOfSize:15.0]; 
  // Set whether the text is displayed in multiple lines  
  tempLabel.numberOfLines = 0; 
  tempLabel.lineBreakMode = NSLineBreakByWordWrapping; 
  // Settings UILabel Adapt height according to text  
  CGSize size = [tempLabel sizeThatFits:CGSizeMake(100, MAXFLOAT)]; 
  // Settings frame 
  tempLabel.frame = CGRectMake(50, 100, 100, size.height); 
  [self.view addSubview:tempLabel]; 
  // Settings label Line spacing of  
  NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:contentStr]; 
  NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init]; 
  [paragraphStyle setLineSpacing:8]; 
  [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [contentStr length])]; 
  [tempLabel setAttributedText:attributedString]; 
  [tempLabel sizeToFit];