获取NSTextField的keyDown事件 [英] Get keyDown event for an NSTextField

问题描述

在xcode的最新版本中，我试图获取NSTextField的keyDown事件. 但是，尽管遵循了Internet上的多个教程(代理，控制器...)，但是我仍然收不到.

In xcode last version, I am trying to get the keyDown event of an NSTextField. However, despite following multiple tutorials on the internet (delegates, controllers...), I still can't receive it.

对我来说有什么简单提示吗?

Any easy hint for me ?

谢谢！

推荐答案

我厌倦了用其他方法以其他方式执行此操作的所有非答案，因此我垂涎三尺并想出一种方法来完成这项工作.这不是直接使用keydown事件，而是在代码块中使用keydown.行为正是我想要的.

I got sick of all the non answers to do it some other way people so I put my nose down and figured out a way to make this work. This isn't using keydown event directly but it is using the keydown in the block. And the behavior is exactly what I wanted.

子类化文本字段

.h

@interface LQRestrictedInputTextField : NSTextField 

.m

在成为第一响应者时，设置本地事件

In the become first responder setup a local event

static id eventMonitor = nil;

- (BOOL)becomeFirstResponder {
    BOOL okToChange = [super becomeFirstResponder];
    if (okToChange) {
        [self setKeyboardFocusRingNeedsDisplayInRect: [self bounds]];

        if (!eventMonitor) {
            eventMonitor = [NSEvent addLocalMonitorForEventsMatchingMask:NSKeyDownMask handler:^(NSEvent *event) {

                NSString *characters = [event characters];
                unichar character = [characters characterAtIndex:0];
                NSString *characterString=[NSString stringWithFormat:@"%c",character];

                NSArray *validNonAlphaNumericArray = @[@" ",@"(",@")",@"[",@"]",@":",@";",@"\'",@"\"",@".",@"<",@">",@",",@"{",@"}",@"|",@"=",@"+",@"-",@"_",@"?",@"#",
                                                   @(NSDownArrowFunctionKey),@(NSUpArrowFunctionKey),@(NSLeftArrowFunctionKey),@(NSRightArrowFunctionKey)];

                if([[NSCharacterSet alphanumericCharacterSet] characterIsMember:character] || character == NSCarriageReturnCharacter || character == NSTabCharacter || character == NSDeleteCharacter || [validNonAlphaNumericArray containsObject:characterString ] ) { //[NSCharacterSet alphanumericCharacterSet]
                }  else {
                    NSBeep();
                    event=nil;
                }
                return event;
            } ];

        }
    }
    NSLog(@"become first responder");
    return okToChange;
}

在文本字段编辑结束后删除事件

remove the event once the textfield editing ends

另外，如果您使用的是ARC，我注意到您可能需要将textview字符串分配给stringValue.我nslog'的stringValue和值被保留.没有nslog，我必须将通知对象字符串分配给stringValue，以防止其被释放.

Also if you're using ARC I noticed you might need to assign the textview string to the stringValue. I nslog'd the stringValue and the value was retained. Without the nslog I had to assign the notification object string to the stringValue to keep it from getting released.

-(void) textDidEndEditing:(NSNotification *)notification {
    [NSEvent removeMonitor:eventMonitor];
    eventMonitor = nil;

    NSTextView *textView=[notification object];
    self.stringValue=textView.string;
}

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