NSTokenField捕获一些事件

Question

我需要实现命令+ Enter，命令+ O和Esc快捷键NSTokenField和解决方案，如https://stackoverflow.com/a/18486965/1067147不工作，因为-(void)noop:(SEL) SEL是没有用的

Answer 1

我的方法是为上层结构类NSView创建类别(我也尝试过NSTextView，但没有运气):

//  NSView+WideInterpreter.h
#import <Cocoa/Cocoa.h>
#define kNotificationTokenModifier          @"kNotificationTokenModifier"
#define kNotificationTokenModifier_modifier @"kNotificationTokenModifier_modifier"
typedef enum{
    BMTokenModifier_CommandEnter = 10,
    BMTokenModifier_CommandO,
    BMTokenModifier_Esc,
    BMTokenModifier_nextKeyViewActivate
} BMTokenModifier;
@interface NSView (WideInterpreter)
@end

和

NSView+WideInterpreter.m
#import "NSView+WideInterpreter.h"
@implementation NSView (WideInterpreter)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
- (void)interpretKeyEvents:(id)keyEvents{
    NSMutableArray *result = [[NSMutableArray alloc] init];
    for (NSEvent *theEvent in keyEvents) {
        NSUInteger clearFlags = ([theEvent modifierFlags] &     NSDeviceIndependentModifierFlagsMask);
        BOOL commandPressed = (clearFlags == NSCommandKeyMask);
        switch ([theEvent keyCode]) {
            case 31:{//Ctrl+O
                if (commandPressed)
                    [[NSNotificationCenter defaultCenter] postNotificationName:kNotificationTokenModifier
                                                                        object:self
                                                                          userInfo:@{kNotificationTokenModifier_modifier: @(BMTokenModifier_CommandO)}];
            }break;
            case 36:{//Enter
                if (commandPressed)
                    [[NSNotificationCenter defaultCenter]     postNotificationName:kNotificationTokenModifier
                                                                        object:self
                                                                          userInfo:@{kNotificationTokenModifier_modifier: @(BMTokenModifier_CommandEnter)}];
                else
                    [super insertNewlineIgnoringFieldEditor:self];
            }break;
            case 53://Esc
                [[NSNotificationCenter defaultCenter] postNotificationName:kNotificationTokenModifier
                                                                    object:self
                                                                  userInfo:@{kNotificationTokenModifier_modifier: @(BMTokenModifier_Esc)}];
                break;
            default:// allow super to handle everything else
                [result addObject:theEvent];
                break;
        }
    }
    [super interpretKeyEvents:result];
}
#pragma clang diagnostic pop
@end

使用:

[[NSNotificationCenter defaultCenter] addObserverForName:kNotificationTokenModifier
                                                  object:nil
                                                   queue:[NSOperationQueue currentQueue]
                                              usingBlock:^(NSNotification *note) {
                                                  BMTokenModifier modifier = (BMTokenModifier)[[[note userInfo] objectForKey:kNotificationTokenModifier_modifier] integerValue];
                                                  switch (modifier) {
                                                      case BMTokenModifier_CommandEnter:
                                                          [self sendMessage];
                                                          break;
                                                      case BMTokenModifier_CommandO:
                                                          [self attachFiles];
                                                          break;
                                                      default:
                                                          break;
                                                  }
                                              }];