本文介绍如何使用UIImagePickerController在iOS应用中实现从照片库选择图片和视频的功能。文章详细讲解了如何检查设备是否支持照片库访问，如何判断用户能否从照片库中选取照片或视频，并通过代码示例展示了具体的实现过程。
1。导入库，实现协议protocol
#import<AssetsLibrary/AssetsLibrary.h>
#import<MobileCoreServices/MobileCoreServices.h>
<UIImagePickerControllerDelegate,UINavigationControllerDelegate>
e.g.
- (BOOL) cameraSupportsMedia:(NSString *)paramMediaType sourceType:(UIImagePickerControllerSourceType)paramSourceType{
__block BOOL result = NO;
if ([paramMediaType length] == 0){
NSLog(@"Media type is empty.");
return NO;
}
NSArray *availableMediaTypes = [UIImagePickerController availableMediaTypesForSourceType:paramSourceType];
[availableMediaTypes enumerateObjectsUsingBlock:
^(id obj, NSUInteger idx, BOOL *stop) {
NSString *mediaType = (NSString *)obj;
if ([mediaType isEqualToString:paramMediaType]){
result = YES;
*stop= YES;
}
}];
return result;
}
- (BOOL) isPhotoLibraryAvailable{
return [UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypePhotoLibrary];
}
- (BOOL) canUserPickVideosFromPhotoLibrary{
return [self cameraSupportsMedia:(__bridge NSString *)kUTTypeMovie
sourceType:UIImagePickerControllerSourceTypePhotoLibrary];
}
- (BOOL) canUserPickPhotosFromPhotoLibrary{
return [self cameraSupportsMedia:(__bridge NSString *)kUTTypeImage
sourceType:UIImagePickerControllerSourceTypePhotoLibrary];
}
- (void)actionRetrieve{
if ([self isPhotoLibraryAvailable]){
NSMutableArray *mediaTypes = [[NSMutableArray alloc] init];
if ([self canUserPickPhotosFromPhotoLibrary]){
[mediaTypes addObject:(__bridge NSString *)kUTTypeImage];
}
if ([self canUserPickVideosFromPhotoLibrary]){
[mediaTypes addObject:(__bridge NSString *)kUTTypeMovie];
}
UIImagePickerController *controller = [[UIImagePickerController alloc] init];
controller.sourceType =UIImagePickerControllerSourceTypePhotoLibrary;
controller.mediaTypes = mediaTypes;
controller.delegate = self;
[self presentViewController:controller animated:YES completion:nil];
}
}
//UIImagePickerControllerDelegate
- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
[picker dismissViewControllerAnimated:YES completion:nil];
NSLog(@"Picked media info = %@", info);
}
//UIImagePickerControllerDelegate
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
[picker dismissViewControllerAnimated:YES completion:nil];
}
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