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POCheck ALAssetsLibrary empty or not
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2013-02-08T07:45:15.627
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<p>I am using ALAssetsLibrary and app getting crashed when it is empty.How do i check whether it is empty or not?.</p> <pre><code> -(void)getLastImageName1 { // if (val < 10) { // NSLog(@"getLastImageName1\n"); ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init]; // Enumerate just the photos and videos group by using ALAssetsGroupSavedPhotos. last =1; [library enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group, BOOL *stop) { // Within the group enumeration block, filter to enumerate just photos. [group setAssetsFilter:[ALAssetsFilter allPhotos]]; if (last == 1) { // NSLog(@"last\n"); last++; // Chooses the photo at the last index [group enumerateAssetsAtIndexes:[NSIndexSet indexSetWithIndex:[group numberOfAssets]-1] options:0 usingBlock:^(ALAsset *alAsset, NSUInteger index, BOOL *innerStop) { // The end of the enumeration is signaled by asset == nil. if (alAsset) { NSString *lastImgNew = alAsset.defaultRepresentation.filename; // NSLog(@"current img name %@\n",lastImgNew); NSString *plistPath1 = [DOCUMENT_DIR_PATH stringByAppendingPathComponent:@"previouslastimagename.plist"]; NSArray *lastImg = [NSArray arrayWithContentsOfFile:plistPath1]; // NSLog(@"get pre lastimg %@\n",lastImg); // NSArray *lastImg = [[DBModel database]getPreviousName]; // NSLog(@"get lastImg %@\n",lastImg); if ([lastImg count] != 0) { // NSLog(@"count\n"); if ([[lastImg objectAtIndex:0] isEqualToString:lastImgNew]) { // NSLog(@"img eql\n"); // UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"" message:@"equal" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; // [alert show]; [self hideImage]; // } } else { // UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"" message:[NSString stringWithFormat:@"pre %@ current %@",[lastImg objectAtIndex:0],lastImgNew] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; // [alert show]; // NSLog(@"img not eql\n"); [self performSelectorOnMainThread:@selector(displayAlert) withObject:nil waitUntilDone:YES]; } } } }]; } } failureBlock: ^(NSError *error) { // Typically you should handle an error more gracefully than this. // NSLog(@"No groups"); }]; </code></pre> <p>The line which after last++ variable.I am checking lastimage with newscreenshot image to not allow user to use app after taking screenshot</p>
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Check ALAssetsLibrary empty or not
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