强制弹出系统键盘(禁用搜狗键盘)

//强制使用系统键盘- (BOOL)application:(UIApplication *)applicationshouldAllowExtensionPointIdentifier:(NSString *)extensionPointIdentifier{    if ([extensionPointIdentifier isEqualToString:@"com.apple.keyboard-service"]) {        return NO;    }    return YES;}