Custom UIActivityIndicatorView | Notes of a Developer

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