如何解除操作表中顯示的UIPicker？

Question

我有一個5個靜態單元格的表視圖控制器和一個叫這樣的UIPicker：

#pragma mark PickerView DataSource 

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView { 
    return 1; 
} 

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{ 
    return [self.cityNames count]; 
} 

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component { 
    return [self.cityNames objectAtIndex:row]; 
} 

#pragma mark PickerView Delegate 
-(void)presentNewPicker{ 
    UIActionSheet *aac = [[UIActionSheet alloc] initWithTitle:@"For which city?" 
                delegate:self 
              cancelButtonTitle:nil 
             destructiveButtonTitle:nil 
              otherButtonTitles:nil]; 


    self.pickrView = [[UIPickerView alloc] initWithFrame:CGRectMake(0.0, 44.0, 0.0, 0.0)]; 
    self.pickrView.showsSelectionIndicator = YES; 
    self.pickrView.dataSource = self; 
    self.pickrView.delegate = self; 

    self.cityNames = [[NSArray alloc] initWithObjects: @"Akron", @"Indie", @"Springfield", @"Loria", @"Merida", nil]; 


    UIToolbar *pickerDateToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)]; 
    pickerDateToolbar.barStyle = UIBarStyleBlackOpaque; 
    [pickerDateToolbar sizeToFit]; 

    NSMutableArray *barItems = [[NSMutableArray alloc] init]; 

    UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil]; 
    [barItems addObject:flexSpace]; 

    UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(pickerDoneClick)]; 
    [barItems addObject:doneBtn]; 

    [pickerDateToolbar setItems:barItems animated:YES]; 

    [aac addSubview:pickerDateToolbar]; 
    [aac addSubview:self.pickrView]; 
    [aac showInView:self.view]; 
    [aac setBounds:CGRectMake(0,0,320, 464)]; 
} 

-(void) dismissActionSheet:(id)sender { 
NSLog(@"dismissActionSheet"); 

UIActionSheet *actionSheet = (UIActionSheet *) ??? how do i get action sheet? :-); 
[actionSheet dismissWithClickedButtonIndex:0 animated:YES]; 
} 

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{ 

    self.myCity.text = [self.cityNames objectAtIndex:row]; 
    NSLog(@"city %@", self.myCity.text); 
} 

的UIPicker呈現但是當我點擊完成按鈕，但我怎麼現在解僱呢？此外，這座城市的日誌記錄爲空，我不知道爲什麼，因爲我啓動了與這些城市的選擇器，並且一旦它們呈現，它們就會出現在選取器中。

Answer 1

儲存在屬性或實例變量

@property (nonatomic) UIActionSheet *actionSheet; 

，當你創建動作片所使用的

UIActionSheet *aac 

self.actionSheet 

代替然後調用

到您的UIActionSheet參考

[self.actionSheeet dismissWithClickedButtonIndex:0 animated:YES]; 

Answer 2

UIActionSheet *aac; 

使其全球