小编San*_*ngh的帖子

我正在从iphone应用程序中的照片库中选择一个图像.我将如何检索实际图像名称.

在.h班

UIImageView * imageView;

UIButton * choosePhotoBtn;

在.m级

-(IBAction) getPhoto:(id) sender 
{
    UIImagePickerController * picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    if((UIButton *) sender == choosePhotoBtn)
    {
        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    }
    else 
    { 
        picker.sourceType = UIImagePickerControllerSourceTypeCamera;
    }
    [self presentModalViewController:picker animated:YES];
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
{
    [picker dismissModalViewControllerAnimated:YES];
    imageView.image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
}

我如何获得图像的实际名称？

我是iphone的新手.请帮我.

提前致谢.

如何找到被点击的引脚的引脚ID(即引脚标题和副标题的详细信息)？

我有这个来显示引脚注释.这段代码在视图中加载:

[resultCoordinate addObjectsFromArray:[sqlClass return_Coordinate]];

if ([resultCoordinate count])
{
    for (int i =0; i < [resultCoordinate count]; i++) 
    {
        dict  = [resultCoordinate objectAtIndex:i];

        MKCoordinateRegion region = { {0.0, 0.0 }, { 0.0, 0.0 } };
        region.center.latitude = [[dict objectForKey:@"Lati"] floatValue];
        region.center.longitude = [[dict objectForKey:@"Longi"] floatValue];
        region.span.longitudeDelta = 0.2f;
        region.span.latitudeDelta = 0.2f;

        NSString *fishName = [dict objectForKey:@"Fish"];
        fishName = [fishName stringByAppendingString:@"  "];

        NSString *fishWeight = [dict objectForKey:@"Weight"];
        fishWeight = [fishWeight stringByAppendingString:@" kg"];


        fishName = [fishName stringByAppendingString:fishWeight];

        MapAnnotation *ann = [[MapAnnotation alloc] …

我是iphone开发的新手.我有一个问题.我想在NSString中转换NSTimeInterval值,但在此不成功.请快速查看下面的代码.

在.h

NSTimeInterval startTime;
NSTimeInterval stopTime;
NSTimeInterval duration;

在.m

startTime = [NSDate timeIntervalSinceReferenceDate];
stopTime = [NSDate timeIntervalSinceReferenceDate];

duration = stopTime-startTime;

NSLog(@"Duration is %@",[NSDate dateWithTimeIntervalSinceReferenceDate: duration]);
NSLog(@"Duration is %@", [NSString stringWithFormat:@"%f", duration]);

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];

NSString *time = [dateFormatter stringFromDate:duration];----> Error
[dateFormatter release];

并在一个标签上设置此字符串----

[timeLabel setText:time];

但它不起作用它显示错误:'stringFromDate:'的参数1的不兼容类型

如果我评论该行,它会在控制台窗口中显示正确的持续时间.

谢谢你的帮助.

我只是在引脚注释上加载一个带有自定义引脚图像的简单地图.第一次正确加载地图中的图像.当我更改地图类型时,引脚会以默认格式更改.你对这个问题有任何想法.任何帮助将不胜感激.谢谢.