How to show image loaded from a url on a button? - iphone

Question

Here is an example :
Show multi image on multi button and show on scrollview
(void)viewDidLoad
{
[super viewDidLoad];
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
InitData *inData=[[InitData alloc]init];
scrollview.delegate=self;
scrollview.scrollEnabled = YES;
int scrollWidth = 120;
scrollview.contentSize = CGSizeMake(scrollWidth,100);
int xOffset = 0;
//imageView.image = [UIImage imageNamed:[imagesName objectAtIndex:0]];
//Test
NSURL *url=[NSURL URLWithString:#"....."];
NSData *jsonData=[NSData dataWithContentsOfURL:url];
if (jsonData !=nil)
{
NSError *error=nil;
id result=[NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:&error];
if (error ==nil)
{
NSLog(#"%#",result);
// NSMutableArray *ArImg = nil;
NSArray* rus=[result objectForKey:#"RespOBJ"];
for (int index = 0; index < rus.count ; index++)
{
NSMutableDictionary* final=[rus objectAtIndex:index];
[inData setId:(int)[final objectForKey:#"Id"]];
[inData setTum:[final objectForKey:#"TumbImage"]];
[inData setImage:[final objectForKey:#"Image"]];
UIButton *btn=[UIButton buttonWithType:UIButtonTypeCustom];
[btn setImage:[UIImage imageNamed:[inData getImage]] forState:(UIControlStateNormal)];
//[btn setImage:[UIImage imageWithData:jsonData] forState:(UIControlStateNormal)];
[btn setTag:index];
btn.bounds = CGRectMake(10, 10, 50, 50);
btn.frame = CGRectMake(5+xOffset, 0, 160, 70);
scrollview.contentSize = CGSizeMake(scrollWidth+xOffset,70);
NSLog(#"%#",[inData getId]);
NSLog(#"%#",[inData getImage]);
NSLog(#"%#",[inData getTum]);
[btn addTarget:self
action: #selector(btnclick:)
forControlEvents: UIControlEventTouchDown];
[scrollview addSubview:btn];
xOffset += 170;
}

Answer 1

The problem with your code is that you are not loading anything. I assume you want to download the image from the Internet and then display it on the scrollview. To do so, you have to use a NSURLRequest and a NSURLConnection.
Have a look at Apple's documentation https://developer.apple.com/library/ios/#documentation/Cocoa/Reference/Foundation/Classes/NSURLRequest_Class/Reference/Reference.html and https://developer.apple.com/library/ios/#documentation/Cocoa/Reference/Foundation/Classes/NSURLConnection_Class/Reference/Reference.html
You might also like this question on how to load data asynchronously Object-c/iOS :How to use ASynchronous to get a data from URL?