如何创建和获取返回值从Cocoa对话框？ [英] How to create and get return Value from Cocoa Dialog?

问题描述

在我的应用程序中，我想创建一个对话框，其中有一个文本字段和一个按钮
，通过它我可以提示用户并获取用户输入的值。

如何在可可，目标C中做到这一点？

我没有找到任何预定义的方法。

<你可以调用NSAlert并将NSTextField作为它的attachmentView，像这样

 
 code>  - （NSString *）input：（NSString *）prompt defaultValue：（NSString *）defaultValue {
 NSAlert * alert = [NSAlert alertWithMessageText：prompt 
 defaultButton：@OK
 alternateButton：@Cancel
 otherButton：nil 
 informativeTextWithFormat：@]; 
 
 NSTextField * input = [[NSTextField alloc] initWithFrame：NSMakeRect ，200，24）]; 
 [input setStringValue：defaultValue]; 
 [input autorelease]; 
 [alert setAccessoryView：input]; 
 NSInteger button = [alert runModal]; 
 if（Button == NSAlertDefaultReturn）{
 [input validateEditing]; 
 return [input stringValue]; 
} else if（button == NSAlertAlternateReturn）{
 return nil; 
} else {
 NSAssert1（NO，@Invalid input dialog button％d，button）; 
 return nil; 
} 
} 
  

In my application, I want to create a dialog box with one text field, and a button, through which i can prompt user and get back user entered value.

How to do this in cocoa, Objective C ?

I didn`t find any predefined method for that.

解决方案

You can call an NSAlert and put the NSTextField as it's accessoryView like this"

- (NSString *)input: (NSString *)prompt defaultValue: (NSString *)defaultValue {
    NSAlert *alert = [NSAlert alertWithMessageText: prompt
                                     defaultButton:@"OK"
                                   alternateButton:@"Cancel"
                                       otherButton:nil
                         informativeTextWithFormat:@""];

    NSTextField *input = [[NSTextField alloc] initWithFrame:NSMakeRect(0, 0, 200, 24)];
    [input setStringValue:defaultValue];
    [input autorelease];
    [alert setAccessoryView:input];
    NSInteger button = [alert runModal];
    if (button == NSAlertDefaultReturn) {
        [input validateEditing];
        return [input stringValue];
    } else if (button == NSAlertAlternateReturn) {
        return nil;
    } else {
        NSAssert1(NO, @"Invalid input dialog button %d", button);
        return nil;
    }
}

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