小编Gau*_*kar的帖子

- (IBAction) showCatPicker {

    if (self.catList !=nil) {
        self.catList=nil;
        [catList release];
    }
    self.catList =  [[NSMutableArray alloc] init];

        self.actionSheet = [[UIActionSheet alloc] initWithTitle:nil delegate:nil cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil];   
    [self.actionSheet setActionSheetStyle:UIActionSheetStyleBlackTranslucent];

    CGRect pickerFrame = CGRectMake(0, 40, 0, 0);   
    if(self.catPicker == nil) {     
        self.catPicker = [[UIPickerView alloc] initWithFrame:pickerFrame];

        self.catPicker.showsSelectionIndicator = YES;
        self.catPicker.dataSource = self;
        self.catPicker.opaque = YES;
        self.catPicker.multipleTouchEnabled = YES;
        self.catPicker.userInteractionEnabled = YES;
        self.catPicker.delegate = self;     
    }

    [self.actionSheet addSubview:self.catPicker];

    UISegmentedControl *closeButton = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObject:@"Select"]];
    closeButton.momentary = YES; 
    closeButton.frame = CGRectMake(260, 7.0f, 50.0f, …