_placeholderLabel

"NSGenericException" - reason: "Access to UITextField's _placeholderLabel ivar is prohibited. This is an application bug"

设置TextFiled的默认文字颜色在iOS13 Crash。

[textfield setValue:[UIColor whiteColor] forKeyPath:@"_placeholderLabel.textColor"];

fix:

import

UILabel *placeholderLabel = object_getIvar(textField, ivar);
placeholderLabel.textColor = [UIColor whiteColor];