自定义 UIPicker-插入图像 [英] Customize UIPicker-Insert Images

问题描述

如下图所示，我正在尝试自定义我的选择器.我已经成功地在我的选择器上添加了图像，但没有影响所有其他选择器.我也把我的代码作为参考.提前非常感谢，感恩节快乐.

As seen image below, I am trying to customize my picker. I have successfully added images on my picker but not affected all other pickers.I have put my code as well for reference. Thanks a lot in advance, happy thanksgiving.

- (void)loadView
{
    picker1 = [[UIPickerView alloc] initWithFrame:CGRectMake(30, 200, 250, 250)];
    picker1.delegate = self;
    picker1.dataSource = self;
    picker1.showsSelectionIndicator = YES;



    picker2 = [[UIPickerView alloc] initWithFrame:CGRectMake(390, 200, 250, 250)];
    picker2.delegate = self;
    picker2.dataSource = self;
    picker2.showsSelectionIndicator = YES;


    picker3 = [[UIPickerView alloc] initWithFrame:CGRectMake(750, 200, 250, 250)];
    picker3.delegate = self;
    picker3.dataSource = self;
    picker3.showsSelectionIndicator = YES;

    self.view = [[UIView alloc] initWithFrame:CGRectZero];
    [self.view addSubview:picker1];
    [self.view addSubview:picker2];
    [self.view addSubview:picker3];


    UIImage *seven = [UIImage imageNamed:@"seven.png"];
    UIImage *bar = [UIImage imageNamed:@"bar.png"];


    for(int i=1; i<=4; i++)
    {
        UIImageView *sevenView = [[UIImageView alloc] initWithImage:seven];
        UIImageView *barView = [[UIImageView alloc] initWithImage:bar];


        NSArray *imageViewArray = [[NSArray alloc] initWithObjects:
                                   sevenView,barView,nil];

        NSString *fieldName = [[NSString alloc] initWithFormat:@"column%d",i];
        [self setValue:imageViewArray forKey:fieldName];
    }

}


-(UIView *)pickerView:(UIPickerView *)pickerView
           viewForRow:(NSInteger)row
         forComponent:(NSInteger)component reusingView:(UIView *)view
{
    NSString *arrayName = [[NSString alloc] initWithFormat:@"column%d",component+1];
    NSArray *array = [self valueForKey:arrayName];
    return [array objectAtIndex:row];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview
    // Release anything that's not essential, such as cached data
}


- (void)dealloc {

}

#pragma mark UIPickerViewDelegate methods

- (NSString*)pickerView:(UIPickerView*)pv titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    return [NSString stringWithFormat:@"%d",row];
}

#pragma mark UIPickerViewDataSource methods

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView*)pv
{
    return 4;
}


- (NSInteger)pickerView:(UIPickerView*)pv numberOfRowsInComponent:(NSInteger)component
{
    return 2;
}

@end

推荐答案

-(UIView *)pickerView:(UIPickerView *)pickerView
           viewForRow:(NSInteger)row
         forComponent:(NSInteger)component reusingView:(UIView *)view
{

    NSArray *array = nil;

    if (pickerView == picker1) {

        array =  [self valueForKey:@"column1"];
    }
    else if (pickerView == picker2) {

        array =  [self valueForKey:@"column2"];
    }
    else if (pickerView == picker3) {

        array = [self valueForKey:@"column3"];
    }

    return [array objectAtIndex:row];
}

这篇关于自定义 UIPicker-插入图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！