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站长之家seo,百度权重排名查询,wordpress的系统构成图,站点推广是什么意思iOS开发-NSOperationQueue实现上传图片队列在开发中，遇到发帖需要上传图片，需要上传队列，这时候用到了NSOperationQueue 一、NSOperation与NSOperationQueue 什么NSOperation NSOperation为控制任务状态、优先级、依赖关系以及任务管理提…

iOS开发-NSOperationQueue实现上传图片队列

在开发中，遇到发帖需要上传图片，需要上传队列，这时候用到了NSOperationQueue

一、NSOperation与NSOperationQueue

什么NSOperation

NSOperation为控制任务状态、优先级、依赖关系以及任务管理提供了一种线程安全的结构。可以通过调用start方法来手动启动一个任务，或者把它加入到NSOperationQueue中，当它到达队列头部时自动启动。

NSOperation的三个执行状态
- isReady、
- isExecuting、
- isFinished

这三个是NSOperation生命周期中的三个互斥的状态。

二、通过NSOperationQueue添加NSOperation

NSOperationQueue，

self.operationQueue = [[NSOperationQueue alloc] init];
[self.operationQueue setMaxConcurrentOperationCount:1];

在NSOperationQueue添加一系列的NSOperation，addDependency会使当前的NSOperation依赖上一个NSOperation完成后执行相应的block操作。

NSOperation *operation = [[NSOperation alloc] init];[self.operationQueue addOperation:operation];for (NSInteger index = 0; index < self.files.count; index++) {NSBlockOperation *theOperation  = [NSBlockOperation blockOperationWithBlock:^{[self uploadFileOperation:index];}];[theOperation addDependency:operation];[self.operationQueue addOperation:theOperation];operation = theOperation;}

三、实现上传功能

针对每一个上传的文件定义对应的文件model

SDUpFileModel.h

#import <Foundation/Foundation.h>typedef NS_ENUM(NSInteger, SDUpFileType) {SDUpFileTypeImage = 0,  //上传的图片类型SDUpFileTypeVoice,      //上传的音频类型SDUpFileTypeVideo       //上传的视频类型
};/**上传的资源类型model，image，voice，video*/
@interface SDUpFileModel : NSObject/**上传的文件类型*/
@property (nonatomic, assign) SDUpFileType fileType;/**上传到七牛的key*/
@property (nonatomic, strong) NSString *key;/**上传所需要的token，七牛的token*/
@property (strong, nonatomic) NSString *token;/**上传的filePath，文件本地路径*/
@property (nonatomic, strong) NSString *filePath;/**上传所需要的参数，视频参数，图片参数，语音参数等，根据fileType，参数不一样*/
@property (nonatomic, strong) NSDictionary *params;@end

SDUpFileModel.m

#import "SDUpFileModel.h"@implementation SDUpFileModel@end

上传的功能使用AFNetworking上传功能

如

NSURL *url = [NSURL URLWithString:kQiniuUpHost];AFHTTPSessionManager *operationManager = [[AFHTTPSessionManager alloc] initWithBaseURL:url];NSMutableDictionary *parameters = [NSMutableDictionary dictionaryWithObjectsAndKeys:theFile.token,@"token",kQiniuUserAgent,@"User-Agent",nil];if (theFile.key){[parameters setObject:theFile.key forKey:@"key"];[parameters setObject:url forKey:theFile.key];}if (theFile.params){for (NSString *key in theFile.params){[parameters setObject:[theFile.params objectForKey:key] forKey:key];}}NSMutableURLRequest *request = [operationManager.requestSerializer multipartFormRequestWithMethod:@"POST" URLString:kQiniuUpHost parameters:parameters constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {if (theFile.fileType == SDUpFileTypeImage) {//上传图片文件[formData appendPartWithFileURL:[NSURL fileURLWithPath:theFile.filePath] name:@"file" fileName:@"file" mimeType:@"image/jpeg" error:nil];} else if (theFile.fileType == SDUpFileTypeVoice) {//语音文件[formData appendPartWithFileURL:[NSURL fileURLWithPath:theFile.filePath] name:@"file" fileName:@"file" mimeType:@"audio/amr" error:nil];} else if (theFile.fileType == SDUpFileTypeVideo) {//mp4视频文件[formData appendPartWithFileURL:[NSURL fileURLWithPath:theFile.filePath] name:@"file" fileName:@"file" mimeType:@"video/mpeg4" error:nil];}} error:nil];__block NSURLSessionUploadTask *task = nil;task = [operationManager uploadTaskWithStreamedRequest:request progress:^(NSProgress * _Nonnull uploadProgress) {float percent = uploadProgress.completedUnitCount * 1.0 / uploadProgress.totalUnitCount;if (self.upProgressHandler) {self.upProgressHandler(theFile, percent);}} completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {NSHTTPURLResponse *taskresponse = (NSHTTPURLResponse *)task.response;if(error == nil) {NSInteger statusCode = taskresponse.statusCode;if (statusCode == 200){if (index == self.files.count -1) {if (self.upAllComplectionHandler) {self.upAllComplectionHandler(self);}}} else{if (self.upFilesFailedHandler) {self.upFilesFailedHandler(self);}[self cancelAllUploadTask];}}else {NSString *errorStr = [responseObject objectForKey:@"error"];if ([errorStr isEqualToString:@"expired token"]) {if (self.upFilesTokenErrorHandler) {self.upFilesTokenErrorHandler(self);}} else {if (self.upFilesFailedHandler) {self.upFilesFailedHandler(self);}}[self cancelAllUploadTask];}}];[task resume];

上传工具的完整代码如下

SDUploaderTool.h

#import <Foundation/Foundation.h>
#import "SDUpFileModel.h"@class SDUploaderTool;/**上传单个文件进度的block*/
typedef void (^UploadProgressHandler)(SDUpFileModel *fileModel, float percent);/**上传所有文件成功的block*/
typedef void (^UploadAllCompletionHandler)(SDUploaderTool *uploader);/**上传文件失败的block，上传文件的token异常，重新上传，重试3次*/
typedef void (^UploadFilesTokenErrorHandler)(SDUploaderTool *uploader);/**上传文件失败的block*/
typedef void (^UploadFilesFailedHandler)(SDUploaderTool *uploader);@interface SDUploaderTool : NSObject/**上传单个文件进度的block*/
@property (nonatomic, copy) UploadProgressHandler upProgressHandler;/**上传所有文件成功的block*/
@property (nonatomic, copy) UploadAllCompletionHandler upAllComplectionHandler;/**上传文件失败的block，上传文件的token异常，重新上传，重试3次*/
@property (nonatomic, copy) UploadFilesTokenErrorHandler upFilesTokenErrorHandler;/**上传文件失败的block*/
@property (nonatomic, copy) UploadFilesFailedHandler upFilesFailedHandler;/**上传的资源列表，其中存储的是SDUpFileModel的对象*/
@property (nonatomic, strong) NSMutableArray *files;/**添加上传文件@param file SDUpFileModel*/
- (void)addFile:(SDUpFileModel *)file;/**添加多个上传文件@param theFiles 文件列表*/
- (void)addFiles:(NSArray *)theFiles;/**开始上传，启动上传*/
- (void)startUpload;/**取消所有的上传请求*/
- (void)cancelAllUploadTask;@end

SDUploaderTool.m

#import "SDUploaderTool.h"
#import <AFNetworking.h>#define kQiniuUpHost @"http://up.qiniu.com"
#define kQiniuUndefinedKey @"?"
#define kQiniuUserAgent  @"qiniu-ios-sdk"@interface SDUploaderTool ()@property (nonatomic, strong) NSOperationQueue *operationQueue;@end@implementation SDUploaderTool- (instancetype)init
{self = [super init];if (self) {self.files = [[NSMutableArray alloc] init];self.operationQueue = [[NSOperationQueue alloc] init];[self.operationQueue setMaxConcurrentOperationCount:1];}return self;
}/**添加上传文件@param file SDUpFileModel*/
- (void)addFile:(SDUpFileModel *)file {[self.files addObject:file];
}/**添加多个上传文件@param theFiles 文件列表*/
- (void)addFiles:(NSArray *)theFiles {[self.files addObjectsFromArray:theFiles];
}/**开始上传，启动上传*/
- (void)startUpload {if (!(self.files && self.files.count > 0)) {return;}NSOperation *operation = [[NSOperation alloc] init];[self.operationQueue addOperation:operation];for (NSInteger index = 0; index < self.files.count; index++) {NSBlockOperation *theOperation  = [NSBlockOperation blockOperationWithBlock:^{[self uploadFileOperation:index];}];[theOperation addDependency:operation];[self.operationQueue addOperation:theOperation];operation = theOperation;}
}/**取消所有的上传请求*/
- (void)cancelAllUploadTask {[self.operationQueue cancelAllOperations];
}/**执行上传，使用AFNetWorking@param index index*/
- (void)uploadFileOperation:(NSInteger)index {SDUpFileModel *theFile = self.files[index];NSURL *url = [NSURL URLWithString:kQiniuUpHost];AFHTTPSessionManager *operationManager = [[AFHTTPSessionManager alloc] initWithBaseURL:url];NSMutableDictionary *parameters = [NSMutableDictionary dictionaryWithObjectsAndKeys:theFile.token,@"token",kQiniuUserAgent,@"User-Agent",nil];if (theFile.key){[parameters setObject:theFile.key forKey:@"key"];[parameters setObject:url forKey:theFile.key];}if (theFile.params){for (NSString *key in theFile.params){[parameters setObject:[theFile.params objectForKey:key] forKey:key];}}NSMutableURLRequest *request = [operationManager.requestSerializer multipartFormRequestWithMethod:@"POST" URLString:kQiniuUpHost parameters:parameters constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {if (theFile.fileType == SDUpFileTypeImage) {//上传图片文件[formData appendPartWithFileURL:[NSURL fileURLWithPath:theFile.filePath] name:@"file" fileName:@"file" mimeType:@"image/jpeg" error:nil];} else if (theFile.fileType == SDUpFileTypeVoice) {//语音文件[formData appendPartWithFileURL:[NSURL fileURLWithPath:theFile.filePath] name:@"file" fileName:@"file" mimeType:@"audio/amr" error:nil];} else if (theFile.fileType == SDUpFileTypeVideo) {//mp4视频文件[formData appendPartWithFileURL:[NSURL fileURLWithPath:theFile.filePath] name:@"file" fileName:@"file" mimeType:@"video/mpeg4" error:nil];}} error:nil];__block NSURLSessionUploadTask *task = nil;task = [operationManager uploadTaskWithStreamedRequest:request progress:^(NSProgress * _Nonnull uploadProgress) {float percent = uploadProgress.completedUnitCount * 1.0 / uploadProgress.totalUnitCount;if (self.upProgressHandler) {self.upProgressHandler(theFile, percent);}} completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {NSHTTPURLResponse *taskresponse = (NSHTTPURLResponse *)task.response;if(error == nil) {NSInteger statusCode = taskresponse.statusCode;if (statusCode == 200){if (index == self.files.count -1) {if (self.upAllComplectionHandler) {self.upAllComplectionHandler(self);}}} else{if (self.upFilesFailedHandler) {self.upFilesFailedHandler(self);}[self cancelAllUploadTask];}}else {NSString *errorStr = [responseObject objectForKey:@"error"];if ([errorStr isEqualToString:@"expired token"]) {if (self.upFilesTokenErrorHandler) {self.upFilesTokenErrorHandler(self);}} else {if (self.upFilesFailedHandler) {self.upFilesFailedHandler(self);}}[self cancelAllUploadTask];}}];[task resume];
}/**释放*/
- (void)dealloc {self.files = nil;[self.operationQueue cancelAllOperations];self.operationQueue = nil;
}@end