ios - 如何在 boundingRectWithSize 中指定 NSLineBreakMode？

Question

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

这是新的替代品

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

但是，如何在 boundingRectWithSize 上指定 lineBreakMode 参数？

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;