objective-c - 设置 PopUpButton 的操作

Question

我以编程方式创建了一个 NSPopUpButton，并为我的选择创建了一个数组，如何为每个单独的数组选择创建一个 setAction？谢谢!

NSRect buttonRect = NSMakeRect(1705, 145, 78, 50); 

    //Button Array.  When I pick the choice it closes the diologue box
    NSArray *newArray;
    NSString *color1 = @"Blue Color";
    NSString *color2 = @"Green Color";
    NSString *color3 = @"Clear Color";

    newArray = [NSArray arrayWithObjects: color1, color2, color3, nil];

    NSPopUpButton *button = [[NSPopUpButton alloc] initWithFrame:buttonRect pullsDown:YES];
    [self addSubview:button];
    [button addItemsWithTitles:newArray];
    //want my action for each individual string
    [button setAction:@selector(changeFilterColor)];

-(void) changeFilterColor
{
    NSLog(@"colorChanged");

}

Answer 1

您需要添加 NSMenuDelegate接口(interface)协议(protocol)(.h 文件):

@interface MyClass : NSObject <NSMenuDelegate>

然后:

[[button menu]setDelegate:self];

创建NSPopUpButton之后。另外，删除带有 setAction: 的行。

复制此委托(delegate)方法:

-(void)menu:(NSMenu *)menu willHighlightItem:(NSMenuItem *)item
{
    if ([item.title isEqualToString:@"Blue Color"]) { ... } //etc
}

添加必要的 if 语句来完成比较。