可可-如何使文本字段不允许文本输入时，在NSTextfield中达到最大长度？

@interface MyTextFieldDelegate : NSObject <NSTextFieldDelegate>
@end

@implementation MyTextFieldDelegate

- (void)controlTextDidChange:(NSNotification *)notification {
    NSTextField *textField = notification.object;
    NSInteger maxLength = 10; // 设置最大长度为10个字符
    
    if (textField.stringValue.length > maxLength) {
        textField.stringValue = [textField.stringValue substringToIndex:maxLength];
    }
}

@end

NSTextField *textField = [[NSTextField alloc] initWithFrame:NSMakeRect(0, 0, 200, 30)];
textField.delegate = [[MyTextFieldDelegate alloc] init];