针对某个 UITextField 禁用第三方键盘

- (BOOL)application:(UIApplication *)application
shouldAllowExtensionPointIdentifier:(NSString *)extensionPointIdentifier
{
    if ([extensionPointIdentifier isEqualToString:@"com.apple.keyboard-service"]) {
        return NO;
    }
    return YES;
}

参考资料

https://juejin.cn/post/6984728963746791454

https://www.jianshu.com/p/48f473f30728