Question

我正在尝试使用图像填充UIPickerView。这是我以编程方式创建PickerView的地方，我填充了NSMutableArray，其中有35个图像，名为1.png，2.png ...，35.png

@interface ShowImagesPVC () <UIPickerViewDataSource, UIPickerViewDelegate>
@property (strong, nonatomic) NSMutableArray *arrayOfImages;
@end

- (void)viewDidLoad
{
    [super viewDidLoad];

    for(int i = 1; i < 36; i++){
        NSString *tmpString = [NSString stringWithFormat:@"%d.png",i];
        [_arrayOfImages addObject:[[UIImageView alloc]initWithImage:[UIImage imageNamed:tmpString]]];
    }

    UIPickerView *myPickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(-5, 0, 315, 200)];
    myPickerView.delegate = self;
    myPickerView.dataSource = self;
    myPickerView.showsSelectionIndicator = YES;
    [self.view addSubview:myPickerView];
}

现在我实现了这些方法

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
    return [_arrayOfImages objectAtIndex:row];
}

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

-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return _arrayOfImages.count;
}

问题是UIPicker已创建，但它是空的，所以我尝试NSLog方法- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view，似乎从未调用过。

知道为什么吗？

Answer 1

试试这个

- (void)viewDidLoad
{
    [super viewDidLoad];
_arrayOfImages = [NSMutableArray array];
    for(int i = 1; i < 36; i++){
        NSString *tmpString = [NSString stringWithFormat:@"%d.png",i];
        [_arrayOfImages addObject:[[UIImageView alloc]initWithImage:[UIImage imageNamed:tmpString]]];
    }

    UIPickerView *myPickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(-5, 0, 315, 200)];
    myPickerView.delegate = self;
    myPickerView.dataSource = self;
    myPickerView.showsSelectionIndicator = YES;
    [self.view addSubview:myPickerView];
}

使用图像填充UIPickerView

1 个答案: