如何在boundingRectWithSize中指定NSLineBreakMode？

Question

[text boundingRectWithSize:BOLIVIASize options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:FONT} context:nil]; 

这是

- (CGSize) sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size lineBreakMode:(NSLineBreakMode) lineBreakMode 

但新更换的，我怎么在指定的boundingRectWithSize参数lineBreakMode？

Answer 1

使用NSParagraphStyleAttributeName & NSParagraphStyle：

NSMutableParagraphStyle *paragraph = [[NSMutableParagraphStyle alloc] init]; 
paragraph.lineBreakMode = NSLineBreakByWordWrapping; //e.g. 

CGSize size = [label.text boundingRectWithSize: constrainedSize options:NSStringDrawingUsesLineFragmentOrigin attributes: @{ NSFontAttributeName: label.font, NSParagraphStyleAttributeName: paragraph } context: nil].size;