將圖片存取的路徑設(shè)置在沙盒中 Document\ 目錄下的

保存圖片代碼：

UIImage *image = [UIImage imageNamed:@"myImage"];
NSString * imageFileName = @"myImage";

//獲取保存路徑
NSArray *documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDirectory = [documentDirectories firstObject];
NSString *path = [documentDirectory stringByAppendingPathComponent:imageFileName];

//從圖片提取JEPG格式的數(shù)據(jù)，0.5表示壓縮質(zhì)量，范圍在0-1之間，1代表最高質(zhì)量（不壓縮）
NSData *data = UIImageJPEGRepresentation(image, 0.5);
//從圖片提取PNG格式的
//NSData *data = UIImagePNGRepresentation(image);

//將JPEG格式的數(shù)據(jù)寫入文件
[data writeToFile:path atomically:YES];

在 Document\ 目錄下就會生成一個叫 ‘myImage’ 的文件，打開這個文件，能看到想要保存的圖片

獲取圖片代碼：

NSString * imageFileName = @"myImage";

//獲取路徑
NSArray *documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDirectory = [documentDirectories firstObject];
NSString *path = [documentDirectory stringByAppendingPathComponent:imageFileName];

UIImage *image = [UIImage imageWithContentsOfFile:path];

刪除圖片文件代碼：

NSString * imageFileName = @"myImage";

//獲取路徑
NSArray *documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDirectory = [documentDirectories firstObject];
NSString *path = [documentDirectory stringByAppendingPathComponent:imageFileName];
[[NSFileManager defaultManager] removeItemAtPath:path error:nil];