NSSearchField不断调用方法

Question

我已经创建了一个存储最近搜索列表的NSSearchField。搜索字段连接到一个方法，该方法使用输入到搜索字段中的文本更新窗口中的标签。问题是，只要用户在搜索字段中键入内容，标签就会立即更新，我需要在用户键入文本并按Enter键之前不更新标签。我可以用典型的NSTextField做到这一点，但我想使用NSSearchField，这样我就可以显示最近的搜索结果。请看我下面的代码，并提供一些建议。谢谢。

接口文件：

#import <Cocoa/Cocoa.h>

@interface AppDelegate : NSObject <NSApplicationDelegate>

@property (assign) IBOutlet NSWindow *window;

@property (weak) IBOutlet NSSearchField *searchField;
@property (weak) IBOutlet NSTextField *textField;

- (IBAction)searchString:(id)sender;

@end

实现文件：

#import "AppDelegate.h"

@implementation AppDelegate

@synthesize window = _window;
@synthesize searchField, textField;

- (void)awakeFromNib {

    if ( [searchField respondsToSelector:@selector(setRecentSearches:)] ) {
        NSMenu *searchMenu = [[NSMenu alloc] initWithTitle:@"Search Menu"];
        [searchMenu setAutoenablesItems:YES];

        NSMenuItem *recentsTitleItem = [[NSMenuItem alloc] initWithTitle:@"Recent Searches" action:nil keyEquivalent:@""];
        [recentsTitleItem setTag:NSSearchFieldRecentsTitleMenuItemTag];
        [searchMenu insertItem:recentsTitleItem atIndex:0];

        NSMenuItem *norecentsTitleItem = [[NSMenuItem alloc] initWithTitle:@"No recent searches" action:nil keyEquivalent:@""];
        [norecentsTitleItem setTag:NSSearchFieldNoRecentsMenuItemTag];
        [searchMenu insertItem:norecentsTitleItem atIndex:1];

        NSMenuItem *recentsItem = [[NSMenuItem alloc] initWithTitle:@"Recents" action:nil keyEquivalent:@""];
        [recentsItem setTag:NSSearchFieldRecentsMenuItemTag];   
        [searchMenu insertItem:recentsItem atIndex:2];

        NSMenuItem *separatorItem = (NSMenuItem*)[NSMenuItem separatorItem];
        [separatorItem setTag:NSSearchFieldRecentsTitleMenuItemTag];
        [searchMenu insertItem:separatorItem atIndex:3];

        NSMenuItem *clearItem = [[NSMenuItem alloc] initWithTitle:@"Clear" action:nil keyEquivalent:@""];
        [clearItem setTag:NSSearchFieldClearRecentsMenuItemTag];
        [searchMenu insertItem:clearItem atIndex:4];

        id searchCell = [searchField cell];
        [searchCell setMaximumRecents:20];
        [searchCell setSearchMenuTemplate:searchMenu];
    }
}

- (IBAction)searchString:(id)sender {
    [textField setStringValue:[searchField stringValue]];
}

@end

Answer 1

如果您不想在代码中执行此操作，请查看nib文件，选择搜索字段，然后选择“发送整个搜索字符串”。

如下所示：

​

​

希望这能有所帮助！

Answer 2

您需要使用searchField.cell setSendsWholeSearchString:是