How can i add image names into an array? - ios

Question

In my app, i have a little problem in memory issue.
My coding skill is not enough to perfect.
My code use memory four time that i really need.
How can i change my coding?
My Code is
-(void)viewDidAppear:(BOOL)animated
{
UIScrollView * ScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 44, self.view.frame.size.width, self.view.frame.size.height-88)];// 44(UpperNavigtionBar),-88(Upper+Lower)
ScrollView.pagingEnabled = YES;
// Create a UIImage to hold Info.png
UIImage *image1 = [UIImage imageNamed:#"Image-001.jpg"];
UIImage *image2 = [UIImage imageNamed:#"Image-002.jpg"];
UIImage *image3 = [UIImage imageNamed:#"Image-003.jpg"];
UIImage *image4 = [UIImage imageNamed:#"Image-004.jpg"];
UIImage *image5 = [UIImage imageNamed:#"Image-005.jpg"];
UIImage *image6 = [UIImage imageNamed:#"Image-006.jpg"];
UIImage *image7 = [UIImage imageNamed:#"Image-007.jpg"];
UIImage *image8 = [UIImage imageNamed:#"Image-008.jpg"];
UIImage *image9 = [UIImage imageNamed:#"Image-009.jpg"];
UIImage *image10 = [UIImage imageNamed:#"Image-010.jpg"];
UIImage *image11 = [UIImage imageNamed:#"Image-011.jpg"];
UIImage *image12 = [UIImage imageNamed:#"Image-012.jpg"];
UIImage *image13 = [UIImage imageNamed:#"Image-013.jpg"];
NSArray *images = [[NSArray alloc] initWithObjects:image1,image2,image3,image4,image5,image6,image7,image8,image9,image10,image11,image12,image13,nil];
NSInteger numberOfViews = 13;
for (int i = 0; i < numberOfViews; i++)
{
CGFloat xOrigin = i * self.view.frame.size.width;
UIImageView * ImageView = [[UIImageView alloc] initWithFrame:CGRectMake(xOrigin, 0, self.view.frame.size.width, self.view.frame.size.height-88)]; // -88(Upper+Lower)
[ImageView setImage:[images objectAtIndex:i]];
[ScrollView addSubview:ImageView];
}
ScrollView.contentSize = CGSizeMake(self.view.frame.size.width*numberOfViews, self.view.frame.size.height-88); // -88(for adding Image View as subview)
[self.view addSubview:ScrollView];
}

Answer 1

There are several things you can do to limit your memory usage. First, you should fill your array with the names of the images, not the images themselves. Given the way your images are named, you should be able to do this in a loop. Second, when you load the image, use imageWithContentsOfFile: instead of imageNamed:. The latter method caches images, while the former doesn't. If you use imageNamed: the memory usage will continue to grow as you scroll through images (even with lazy loading) because of the caching -- at some point the system should purge the cache, which should keep your app from crashing, but I don't think it will keep the system for shutting down other programs that are in the background on a device.