ios - 如何检测用户何时更改键盘？

Question

有什么方法可以检测用户何时更改键盘类型，特别是在这种情况下更改为 Emoji 键盘？

Answer 1

您可以使用 UITextInputMode 来检测 currentInputMode 的当前语言——表情符号被视为一种语言。来自docs :

An instance of the UITextInputMode class represents the current text-input mode. You can use this object to determine the primary language currently being used for text input.

您可以像这样测试表情符号键盘:

NSString *language = [[UITextInputMode currentInputMode] primaryLanguage];
BOOL isEmoji = [language isEqualToString:@"emoji"];
if (isEmoji)
{
   // do something
}

您可以通过 UITextInputCurrentInputModeDidChangeNotification 收到输入模式更改的通知。这将在当前输入模式更改时发布。

这是一个简单的应用程序，它会在模式更改时打印 NSLog:

- (void)viewDidLoad
{
    [super viewDidLoad];
    [[NSNotificationCenter defaultCenter] addObserver:self
         selector:@selector(changeInputMode:) 
             name:UITextInputCurrentInputModeDidChangeNotification object:nil];}
}

-(void)changeInputMode:(NSNotification *)notification
{
    NSString *inputMethod = [[UITextInputMode currentInputMode] primaryLanguage];
    NSLog(@"inputMethod=%@",inputMethod);
}  

或者如果你喜欢 Swift :

import UIKit

class ViewController: UIViewController 
{

    override func viewDidLoad() {
        super.viewDidLoad()

        NSNotificationCenter.defaultCenter().addObserver(self, 
       selector: "changeInputMode:", 
           name: UITextInputCurrentInputModeDidChangeNotification, object: nil)
    }

    func changeInputMode(notification : NSNotification)
    {
        let inputMethod = UITextInputMode.currentInputMode().primaryLanguage
        println("inputMethod: \(inputMethod)")
    }


}