折腾了好久，使用富文本进行控制解决。
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;
NSDictionary *attributes = @{NSParagraphStyleAttributeName:paragraphStyle};
lable.numberOfLines = 0;
lable.attributedText = [[NSAttributedString alloc] initWithString:@"Your loan has been successfully applied." attributes:attributes];
