注意: paragraphSpacingBefore 属性必须和换行符'\n'配合使用才能起作用
self.label = [[UILabel alloc] initWithFrame:CGRectMake(10, 100, 100, 120)];;
self.label.numberOfLines = 0;
[self.view addSubview:self.label];
NSMutableAttributedString *attributed = [[NSMutableAttributedString alloc] initWithString:@"哈哈哈哈哈哈哈3423p4ou123piuppoiu" attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:14],NSForegroundColorAttributeName:[UIColor redColor]}];
self.label.attributedText = attributed;
self.label.backgroundColor = [UIColor cyanColor];
self.label2 = [[UILabel alloc] initWithFrame:CGRectMake(10, 300, 100, 220)];
self.label2.numberOfLines = 0;
[self.view addSubview:self.label2];
NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
style.lineBreakMode = NSLineBreakByTruncatingTail;
style.paragraphSpacingBefore = 40;
NSAttributedString *attributedst = [[NSAttributedString alloc] initWithString:@"\n哈哈哈哈哈哈哈3423p4ou123piuppoiu" attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:14],NSForegroundColorAttributeName:[UIColor redColor],NSParagraphStyleAttributeName:style}];
[attributed appendAttributedString:attributedst];
self.label2.backgroundColor = [UIColor greenColor];
self.label2.attributedText = attributed;
效果图