ios - NSMutableArray to NSString to UIImageView CODE CRASHES -



ios - NSMutableArray to NSString to UIImageView CODE CRASHES -

any thought why code crash? taking nsmutablearray converting nsstring , using string url uiimageview. crashes @ nsurl line.

nsstring *imgstring = [imageone componentsjoinedbystring:@""]; nsurl *imageurl = [nsurl urlwithstring:imgstring]; dispatch_async(dispatch_get_global_queue(dispatch_queue_priority_background, 0), ^{ nsdata *imagedata = [nsdata datawithcontentsofurl:imageurl]; dispatch_async(dispatch_get_main_queue(), ^{ // update ui self.imageview.image = [uiimage imagewithdata:imagedata]; }); });

from apple documentation,

urlstring: url string initialize nsurl object. must url conforms rfc 2396. method parses urlstring according rfcs 1738 , 1808.

in os x v10.7 , later or ios 5 , later, method returns nil if url string nil. in before versions, method throws exception if url string nil.

ios objective-c iphone nsstring nsmutablearray

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