NSMutableParagraphStyle和NSAttributedString無法處理文字

Question

我正在嘗試使用行間距爲1.25的多行NSAttributedString。

NSMutableParagraphStyle *bodyFormat = [[NSMutableParagraphStyle alloc] init]; 
bodyFormat.alignment = NSTextAlignmentLeft; 
//[bodyFormat setLineSpacing:5]; 
[bodyFormat setLineBreakMode:NSLineBreakByWordWrapping]; 
//[bodyFormat setMaximumLineHeight:5]; 
[bodyFormat setLineHeightMultiple:1.25]; 





NSMutableAttributedString *desc = [[NSMutableAttributedString alloc] initWithString:@"So why to use Lorem Ipsum and why placeholder text is necessary? Naturally, page designs that are made for text documents must contain some text rather than placeholder dots or something else. Howevr, should they contain a proper English words and sentenses almost every reader will deliberately try to interpret it eventually missing the design itself"]; 
[desc addAttribute:NSParagraphStyleAttributeName value:bodyFormat range:NSMakeRange(0, desc.length)]; 





UILabel *description = [[UILabel alloc] initWithFrame:CGRectMake(0, 
                   20, 
                   300, 
                   1000)]; 

description.lineBreakMode = NSLineBreakByWordWrapping; 
[description setAttributedText:desc]; 
[self.view addSubview:description]; 

這會產生一條線，並且換行不起作用。

我在做什麼錯？

Answer 1

[bodyFormat setLineSpacing:5]; 

打破了這種行爲。

還設置

description.numberOfLines = 0; 

幫助......（說明是的UILabel）