//placeholder的背景颜色
_textField1.placeholder = @"邮箱/手机号";
[_textField1 setValue:[UIColor whiteColor] forKeyPath:@"placeholderLabel.textColor"];
//placeholder的背景颜色
_textField1.placeholder = @"邮箱/手机号";
[_textField1 setValue:[UIColor whiteColor] forKeyPath:@"placeholderLabel.textColor"];