iOS开发修改UITextField的placeholder的颜色字体大小等

贴上代码

UITextField *textField = [UITextField new];NSString *placeHolderStr = @"我是placeholder";textField.placeholder = placeHolderStr;NSMutableAttributedString *placeholder = [[NSMutableAttributedString alloc] initWithString:placeHolderStr];[placeholder addAttribute:NSForegroundColorAttributeName                        value:[UIColor whiteColor]                        range:NSMakeRange(0, placeHolderStr.length)];[placeholder addAttribute:NSFontAttributeName                        value:[UIFont boldSystemFontOfSize:16]                        range:NSMakeRange(0, placeHolderStr.length)];textField.attributedPlaceholder = placeholder;