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Custom UIActivityIndicatorView

Little modified UIActivityIndicatorView with the ability to display activity indicator before the download data.

UIDownloadActivityIndicator.h

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@class UIProgressView;
@protocol UIDownloadActivityIndicatorDelegate;

@interface UIDownloadActivityIndicator : UIActivityIndicatorView {
     NSURLRequest* DownloadRequest;
     NSURLConnection* DownloadConnection;
     NSMutableData* receivedData;
     NSString* localFilename;
     id delegate;
     long long bytesReceived;
     long long expectedBytes;
     
     float percentComplete;
}

- (UIDownloadActivityIndicator *)initWithURL:(NSURL *)fileURL withActivityIndicatorStyle:(UIActivityIndicatorViewStyle)style timeout:(NSInteger)timeout delegate:(id)theDelegate;
- (void) setURL:(NSURL *)fileURL timeout:(NSInteger)timeout;


@property (nonatomic, readonly) NSMutableData* receivedData;
@property (nonatomic, readonly, retain) NSURLRequest* DownloadRequest;
@property (nonatomic, readonly, retain) NSURLConnection* DownloadConnection;
@property (nonatomic, assign) id delegate;

@property (nonatomic, readonly) float percentComplete;

@end

@protocol UIDownloadActivityIndicatorDelegate

@optional
- (void)downloadBar:(UIDownloadActivityIndicator *)downloadBar didFinishWithData:(NSData *)fileData suggestedFilename:(NSString *)filename;
- (void)downloadBar:(UIDownloadActivityIndicator *)downloadBar didFailWithError:(NSError *)error;
- (void)downloadBarUpdated:(UIDownloadActivityIndicator *)downloadBar;

@end


UIDownloadActivityIndicator.m

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#import "UIDownloadActivityIndicator.h"

@implementation UIDownloadActivityIndicator

@synthesize DownloadRequest,
DownloadConnection,
receivedData,
delegate,
percentComplete;


- (UIDownloadActivityIndicator *)initWithURL:(NSURL *)fileURL withActivityIndicatorStyle:(UIActivityIndicatorViewStyle)style timeout:(NSInteger)timeout delegate:(id)theDelegate {
     self = [super initWithActivityIndicatorStyle:style];
     if(self) {
          self.delegate = theDelegate;
          bytesReceived = percentComplete = 0;
          localFilename = [[[fileURL absoluteString] lastPathComponent] copy];
          receivedData = [[NSMutableData alloc] initWithLength:0];
          //self.progress = 0.0;
          [self startAnimating];
          self.backgroundColor = [UIColor clearColor];
          DownloadRequest = [[NSURLRequest alloc] initWithURL:fileURL cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:timeout];
          DownloadConnection = [[NSURLConnection alloc] initWithRequest:DownloadRequest delegate:self startImmediately:YES];
         
          if(DownloadConnection == nil) {
               [self.delegate downloadBar:self
                           didFailWithError:[NSError errorWithDomain:@"UIDownloadBar Error"
                                                                         code:1
                                                                    userInfo:[NSDictionary
                                                                                 dictionaryWithObjectsAndKeys:@"NSURLConnection Failed",
                                                                                 NSLocalizedDescriptionKey, nil]]];
          }
     }
     
     return self;
}

- (void) setURL:(NSURL *)fileURL timeout:(NSInteger)timeout {
     [receivedData release];
     [DownloadRequest release];
     
     
     bytesReceived = percentComplete = 0;
     localFilename = [[[fileURL absoluteString] lastPathComponent] copy];
     
     receivedData = [[NSMutableData alloc] initWithLength:0];
     
     DownloadRequest = [[NSURLRequest alloc] initWithURL:fileURL cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:timeout];
     DownloadConnection = [[NSURLConnection alloc] initWithRequest:DownloadRequest delegate:self startImmediately:YES];
     
     if(DownloadConnection == nil) {
          [self.delegate downloadBar:self
                      didFailWithError:[NSError errorWithDomain:@"UIDownloadBar Error"
                                                                    code:1
                                                               userInfo:[NSDictionary
                                                                            dictionaryWithObjectsAndKeys:@"NSURLConnection Failed",
                                                                            NSLocalizedDescriptionKey, nil]]];
     }
}


- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
     [self.receivedData appendData:data];
     
     NSInteger receivedLen = [data length];
     bytesReceived = (bytesReceived + receivedLen);
     
     if(expectedBytes != NSURLResponseUnknownLength) {
          //self.progress = ((bytesReceived/(float)expectedBytes)*100)/100;
          //percentComplete = self.progress*100;
     }
     
     [delegate downloadBarUpdated:self];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
     [self.delegate downloadBar:self didFailWithError:error];
     [connection release];
     connection = nil;
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
     expectedBytes = [response expectedContentLength];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
     [self.delegate downloadBar:self didFinishWithData:self.receivedData suggestedFilename:localFilename];
     [connection release];
     connection = nil;
}

- (void)drawRect:(CGRect)rect {
     [super drawRect:rect];
}

- (void)dealloc {
     [localFilename release];
     [receivedData release];
     [DownloadRequest release];
     if (DownloadConnection != nil ) {
          [DownloadConnection release];
          DownloadConnection = nil;
     }
     [super dealloc];
}

@end

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