（iOS开发）修改textfeiled中placeholder的字体，颜色，大小

textfeiled 使用(placeholder属性修改 )

//placeholder的位置，大小   sureNewPassWordTF.leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, currentPWDTF.frame.size.height)];    sureNewPassWordTF.leftViewMode = UITextFieldViewModeAlways;    [sureNewPassWordTF setValue:[UIFont boldSystemFontOfSize:15] forKeyPath:@"_placeholderLabel.font"];