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dpettigrew/UIButton+AFNetworking.h

Created June 13, 2012 19:11
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  1. dpettigrew created this gist Jun 13, 2012.
    44 changes: 44 additions & 0 deletions UIButton+AFNetworking.h
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    //
    // UIButton+AFNetworking.h
    //
    // Created by David Pettigrew on 6/12/12.
    // Copyright (c) 2012 ELC Technologies. All rights reserved.
    //

    // Based upon UIImageView+AFNetworking.h
    //
    // Copyright (c) 2011 Gowalla (http://gowalla.com/)
    //
    // Permission is hereby granted, free of charge, to any person obtaining a copy
    // of this software and associated documentation files (the "Software"), to deal
    // in the Software without restriction, including without limitation the rights
    // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    // copies of the Software, and to permit persons to whom the Software is
    // furnished to do so, subject to the following conditions:
    //
    // The above copyright notice and this permission notice shall be included in
    // all copies or substantial portions of the Software.
    //
    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    // THE SOFTWARE.

    #import <Foundation/Foundation.h>
    #import "AFImageRequestOperation.h"

    #import <Availability.h>

    #if __IPHONE_OS_VERSION_MIN_REQUIRED
    #import <UIKit/UIKit.h>

    @interface UIButton (AFNetworking)

    - (void)setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholderImage forState:(UIControlState)state;

    @end

    #endif
    183 changes: 183 additions & 0 deletions UIButton+AFNetworking.m
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    //
    // UIButton+AFNetworking.m
    //
    // Created by David Pettigrew on 6/12/12.
    // Copyright (c) 2012 ELC Technologies. All rights reserved.
    //

    // Based upon UIImageView+AFNetworking.m
    //
    // Copyright (c) 2011 Gowalla (http://gowalla.com/)
    //
    // Permission is hereby granted, free of charge, to any person obtaining a copy
    // of this software and associated documentation files (the "Software"), to deal
    // in the Software without restriction, including without limitation the rights
    // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    // copies of the Software, and to permit persons to whom the Software is
    // furnished to do so, subject to the following conditions:
    //
    // The above copyright notice and this permission notice shall be included in
    // all copies or substantial portions of the Software.
    //
    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    // THE SOFTWARE.

    #import "UIButton+AFNetworking.h"
    #import <objc/runtime.h>

    #if __IPHONE_OS_VERSION_MIN_REQUIRED

    @interface AFButtonImageCache : NSCache
    - (UIImage *)cachedImageForRequest:(NSURLRequest *)request;
    - (void)cacheImage:(UIImage *)image
    forRequest:(NSURLRequest *)request;
    @end

    #pragma mark -

    static char kAFImageRequestOperationObjectKey;

    @interface UIButton (_AFNetworking)
    @property (readwrite, nonatomic, retain, setter = af_setImageRequestOperation:) AFImageRequestOperation *af_imageRequestOperation;
    @end

    @implementation UIButton (_AFNetworking)
    @dynamic af_imageRequestOperation;
    @end

    #pragma mark -

    @implementation UIButton (AFNetworking)

    - (void)setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholderImage forState:(UIControlState)state {
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:30.0];
    [request setHTTPShouldHandleCookies:NO];
    [request setHTTPShouldUsePipelining:YES];

    [self setImageWithURLRequest:request placeholderImage:placeholderImage forState:state success:nil failure:nil];
    }

    - (void)setImageWithURLRequest:(NSURLRequest *)urlRequest
    placeholderImage:(UIImage *)placeholderImage
    forState:(UIControlState)state
    success:(void (^)(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image))success
    failure:(void (^)(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error))failure
    {
    [self cancelImageRequestOperation];

    UIImage *cachedImage = [[[self class] af_sharedImageCache] cachedImageForRequest:urlRequest];
    if (cachedImage) {
    [self setImage:cachedImage forState:state];
    self.af_imageRequestOperation = nil;

    if (success) {
    success(nil, nil, cachedImage);
    }
    } else {
    [self setImage:placeholderImage forState:state];

    AFImageRequestOperation *requestOperation = [[AFImageRequestOperation alloc] initWithRequest:urlRequest];
    [requestOperation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
    if ([[urlRequest URL] isEqual:[[self.af_imageRequestOperation request] URL]]) {
    [self setImage:responseObject forState:state];
    self.af_imageRequestOperation = nil;
    }

    if (success) {
    success(operation.request, operation.response, responseObject);
    }

    [[[self class] af_sharedImageCache] cacheImage:responseObject forRequest:urlRequest];


    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    if ([[urlRequest URL] isEqual:[[self.af_imageRequestOperation request] URL]]) {
    self.af_imageRequestOperation = nil;
    }

    if (failure) {
    failure(operation.request, operation.response, error);
    }

    }];

    self.af_imageRequestOperation = requestOperation;

    [[[self class] af_sharedImageRequestOperationQueue] addOperation:self.af_imageRequestOperation];
    }
    }

    - (AFHTTPRequestOperation *)af_imageRequestOperation {
    return (AFHTTPRequestOperation *)objc_getAssociatedObject(self, &kAFImageRequestOperationObjectKey);
    }

    - (void)af_setImageRequestOperation:(AFImageRequestOperation *)imageRequestOperation {
    objc_setAssociatedObject(self, &kAFImageRequestOperationObjectKey, imageRequestOperation, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    }

    + (NSOperationQueue *)af_sharedImageRequestOperationQueue {
    static NSOperationQueue *_af_imageRequestOperationQueue = nil;

    if (!_af_imageRequestOperationQueue) {
    _af_imageRequestOperationQueue = [[NSOperationQueue alloc] init];
    [_af_imageRequestOperationQueue setMaxConcurrentOperationCount:8];
    }

    return _af_imageRequestOperationQueue;
    }

    + (AFButtonImageCache *)af_sharedImageCache {
    static AFButtonImageCache *_af_imageCache = nil;
    static dispatch_once_t oncePredicate;
    dispatch_once(&oncePredicate, ^{
    _af_imageCache = [[AFButtonImageCache alloc] init];
    });

    return _af_imageCache;
    }

    #pragma mark -

    - (void)cancelImageRequestOperation {
    [self.af_imageRequestOperation cancel];
    self.af_imageRequestOperation = nil;
    }

    @end

    #pragma mark -

    static inline NSString * AFButtonImageCacheKeyFromURLRequest(NSURLRequest *request) {
    return [[request URL] absoluteString];
    }

    @implementation AFButtonImageCache

    - (UIImage *)cachedImageForRequest:(NSURLRequest *)request {
    switch ([request cachePolicy]) {
    case NSURLRequestReloadIgnoringCacheData:
    case NSURLRequestReloadIgnoringLocalAndRemoteCacheData:
    return nil;
    default:
    break;
    }

    return [self objectForKey:AFButtonImageCacheKeyFromURLRequest(request)];
    }

    - (void)cacheImage:(UIImage *)image
    forRequest:(NSURLRequest *)request
    {
    if (image && request) {
    [self setObject:image forKey:AFButtonImageCacheKeyFromURLRequest(request)];
    }
    }

    @end

    #endif