iphone document 图片存储和读取
存：
//此处首先指定了图片存取路径（默认写到应用程序沙盒 中） NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES); //并给文件起个文件名 NSString *uniquePath=[[paths objectAtIndex:0] stringByAppendingPathComponent:@"pin.png"]; BOOL blHave=[[NSFileManager defaultManager] fileExistsAtPath:uniquePath]; if (blHave) { NSLog(@"already have"); return ; } //此处的方法是将图片写到Documents文件中 如果写入成功会弹出一个警告框,提示图片保存成功 NSString *strPathOld = [[NSBundle mainBundle] pathForResource:@"pin" ofType:@"png"]; NSData *data = [NSData dataWithContentsOfFile:strPathOld]; BOOL result = [data writeToFile:uniquePath atomically:YES]; if (result) { NSLog(@"success"); }else { NSLog(@"no success"); } NSFileManager *fileManager = [NSFileManager defaultManager]; NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString *filePath2 = [documentsDirectory stringByAppendingPathComponent:@"pin.png"]; UIImage *img = [UIImage imageWithContentsOfFile:filePath2]; [image setImage:img]; NSLog(@"图片：：：：：：：：：%@",image.image);
NSFileManager* fileManager=[NSFileManager defaultManager]; NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES); //文件名 NSString *uniquePath=[[paths objectAtIndex:0] stringByAppendingPathComponent:@"pin.png"]; BOOL blHave=[[NSFileManager defaultManager] fileExistsAtPath:uniquePath]; if (!blHave) { NSLog(@"no have"); return ; }else { NSLog(@" have"); BOOL blDele= [fileManager removeItemAtPath:uniquePath error:nil]; if (blDele) { NSLog(@"dele success"); }else { NSLog(@"dele fail"); } }