弹出UIPickerView

Question

我知道很多人都提出了同样的问题，而且我已经尝试了很多这样的问题，我不知道我想念的是哪一部分，我仍然可以让它发挥作用。

我有一个9 * 9的表，我想显示和更改，因为Iphone屏幕的大小，我想一次显示一列。 我想要的是按下左上角的按钮，弹出的UIPickerView允许我选择要显示的列，然后重新加载UITextFields。

有人能给我一个详细的答案吗？我还是比较新的（几个月）。 提前谢谢。

UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:nil 
                                                delegate:nil
                                                cancelButtonTitle:nil
                                                destructiveButtonTitle:nil
                                                otherButtonTitles:nil];

[actionSheet setActionSheetStyle:UIActionSheetStyleBlackTranslucent];

CGRect pickerFrame = CGRectMake(0, 40, 0, 0);

UIPickerView *pickerView = [[UIPickerView alloc] initWithFrame:pickerFrame];
pickerView.showsSelectionIndicator = YES;
pickerView.dataSource = self;
pickerView.delegate = self;

[actionSheet addSubview:pickerView];


UISegmentedControl *closeButton = [[UISegmentedControl alloc] initWithItems:[NSArray     arrayWithObject:@"Close"]];
closeButton.momentary = YES; 
closeButton.frame = CGRectMake(260, 7.0f, 50.0f, 30.0f);
closeButton.segmentedControlStyle = UISegmentedControlStyleBar;
closeButton.tintColor = [UIColor blackColor];
[closeButton addTarget:self action:@selector(dismissActionSheet:)   forControlEvents:UIControlEventValueChanged];
[actionSheet addSubview:closeButton];
[closeButton release];

[actionSheet showInView:[[UIApplication sharedApplication] keyWindow]];

[actionSheet setBounds:CGRectMake(0, 0, 320, 485)];

上面是我找到的代码，它弹出正常，我有问题将数组添加到pickerview，并且任何人都可以告诉我dismissActionSheet方法应该如何？ 谢谢。

Answer 1

好的，所以我想我明白你在问什么，如果这不是你需要的帮助，请纠正我...但是要在拾取器视图中添加一个数组（大概是NSStrings）你需要使用{ {1}}委托方法。这是一个快速检查：

- (NSString *)pickerView:titleForRow:forComponent:

使用操作表进行模拟，您需要添加委托方法，以便在用户单击操作表上的按钮时进行处理

//Say you have an array of strings you want to present in the pickerview like this
NSArray *arrayOfStrings = [NSArray arrayWithObjects:@"One", @"Two", @"Three", @"Four", nil];

//First we need to say how many rows there will be in the pickerview
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    return [arrayOfStrings count];
}

//Do the same for components (columns) in pickerview
    - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    return 1;
}
//Here we set the actual title/string on the pickerview
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
    if(component==0){
        //Grab the nth string from array
        return [arrayOfStrings objectAtIndex:row];
    }
}
//This is called if a user taps a row
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
    if(component==0)
    NSLog(@"The User Selected the row titled %@", [arrayOfStrings objectAtIndex:row]);
}