how to copy ui image to another variable?

Question

i want to set uiimage to a variable outside the scope of function .i tried the code below but it doesn't work . code below is used in custom uitable view cell class . so i just cannot alloc and init it . as this will cause to initialize it every time cell is displayed/ scrolled

 uiimage *img;
    [manager downloadWithURL:[NSURL URLWithString:friendData.picUrl] options:SDWebImageRefreshCached progress:^(NSInteger receivedSize, NSInteger expectedSize) {

    } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished) {

        img =image; ////this is not working !!



    }];


    dispatch_async(dispatch_get_main_queue(), ^{


        [cell.profileImage setImage:img];   //and off course this wont work too

    });

could u post some code where that `UIImage *image1` is declared? — sreekanthk, Sep 19 '14 at 07:11
Maybe you need to initiate it before assign the UIImage value? Try UIImage *img = [[UIImage alloc] init]; — felixwcf, Sep 19 '14 at 07:24

score 1 · Answer 1 · answered Sep 19 '14 at 08:01

1

I think you may just need to set __block UIImage image = nil;

answered Sep 19 '14 at 08:01

dmerlea

894
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replace this: uiimage *img; – dmerlea Sep 19 '14 at 08:10
1

it works :) but can u explain it a little why its working ? i am new to "blocks" – warzone_fz Sep 19 '14 at 08:12
You can read here: http://stackoverflow.com/a/7081005/3725351 And accept this answear – dmerlea Sep 19 '14 at 08:17
Essential is this part: When they are marked with __block, the modifications done inside the block are also visible outside of it. – dmerlea Sep 19 '14 at 08:19

score 0 · Answer 2 · answered Sep 19 '14 at 07:30

You can initialize the image1 with any other initializing methods: Try this one:

image1 = UIImage.init(CGImage:image.CGImage);

Initializer method will create new object as per this document.

I haven't tried it. Please try if it works. If not working just comment me, I may find other solution.

score 0 · Answer 3 · answered Sep 19 '14 at 07:58

0

you need to allocate image1 to make it work out of the function.try this

image1 = [[UIImage alloc] initWithCGImage: image.CGImage];

answered Sep 19 '14 at 07:58

Mounika Vangala

396
2
3
14

how to copy ui image to another variable?

3 Answers3