iOS breakpoints Download Han Junqiang's Blog

The layout is as follows:

Basic Drag Properties:

#import "ViewController.h" #import "AFNetworking.h" @interface Viewcontroller () @property (weak, nonatomic) Iboutlet UILabel *progresslabel; @property (weak, nonatomic) Iboutlet Uiprogressview *progressview; @property (nonatomic, Strong) Afhttprequestoperation *operation, @end @implementation Viewcontroller

Call:

-(void) viewdidload{    [Super Viewdidload];        NSString *cachepath = Nssearchpathfordirectoriesindomains (Nscachesdirectory, Nsuserdomainmask, YES). LastObject;        NSString *txtpath = [CachePath stringbyappendingpathcomponent:@ "Mvtemp/mv.txt"];    Nsfilemanager *filemanager = [Nsfilemanager Defaultmanager];        if ([FileManager Fileexistsatpath:txtpath]) {        self.progressView.progress = [[NSString stringwithcontentsoffile: Txtpath encoding:nsutf8stringencoding Error:nil] floatvalue];        Self.progressLabel.text = [NSString stringwithformat:@ "%.2f%%", _progressview.progress *];            } else {        self.progressView.progress = 0;        Self.progressLabel.text = @ "0%";    }    NSLog (@ "%@", Nshomedirectory ());    }

Click events:

-(Ibaction) Startorcanceldownload: (UIButton *) sender{if ([sender.currenttitle isequaltostring:@ "start Download]") {[Send                       Er settitle:@ "pause download" forstate:uicontrolstatenormal];        NSString *cachepath = Nssearchpathfordirectoriesindomains (Nscachesdirectory, Nsuserdomainmask, YES). LastObject;        NSString *filepath = [CachePath stringbyappendingpathcomponent:@ "MV"];        NSString *temppath = [CachePath stringbyappendingpathcomponent:@ "Mvtemp"];        Nsfilemanager *filemanager = [Nsfilemanager Defaultmanager]; if (![ FileManager Fileexistsatpath:filepath]) {[FileManager Createdirectoryatpath:filepath WithIntermediateDirectori        Es:yes Attributes:nil Error:nil]; } if (![ FileManager Fileexistsatpath:temppath]) {[FileManager Createdirectoryatpath:temppath WithIntermediateDirectori        Es:yes Attributes:nil Error:nil];        } nsstring *mp4temppath = [TempPath stringbyappendingpathcomponent:@ "Mv.temp"]; NSString *txttemPpath = [TempPath stringbyappendingpathcomponent:@ "Mv.txt"];        NSString *mp4path = [FilePath stringbyappendingpathcomponent:@ "Mv.mp4"];        Nsurl *url = [Nsurl urlwithstring:@ "Http://video.szzhangchu.com/1442395443772_5176326090.mp4"];        Nsurlrequest *request = [Nsurlrequest Requestwithurl:url];        unsigned long long downloadbytes = 0;            if ([FileManager Fileexistsatpath:mp4temppath]) {downloadbytes = [self filesizeatpath:mp4temppath];            NSString *range = [NSString stringwithformat:@ "bytes=%llu-", downloadbytes];            Nsmutableurlrequest *mutablerequest = [request mutablecopy];            [Mutablerequest setvalue:range forhttpheaderfield:@ "range"];        request = Mutablerequest; } if (![ FileManager Fileexistsatpath:mp4path]) {self.operation = [[Afhttprequestoperation alloc] Initwithrequest:reque            ST]; [Self.operation Setoutputstream:[nsoutputstream Outputstreamtofileatpath:mp4temppath Append:YES]];            __weak typeof (self) weakself = self; [_operation setdownloadprogressblock:^ (Nsuinteger bytesread, Long long totalbytesread, long long Totalbytesexpectedtoread) {weakSelf.progressView.progress = (float) (Totalbytesread + downloadbytes)/(Flo                at) (Totalbytesexpectedtoread + downloadbytes);                WeakSelf.progressLabel.text = [NSString stringwithformat:@ "%.2f%%", weakSelf.progressView.progress * 100];                NSString *progress = [NSString stringwithformat:@ "%.3f", weakSelf.progressView.progress];                            [Progress Writetofile:txttemppath Atomically:yes encoding:nsutf8stringencoding Error:nil];                        }]; [_operation setcompletionblockwithsuccess:^ (afhttprequestoperation *operation, id responseobject)                {[FileManager moveitematpath:mp4temppath topath:mp4path Error:nil];                    [FileManager Removeitematpath:txttemppath Error:nil];        } failure:^ (Afhttprequestoperation *operation, Nserror *error) {}];        [_operation start];        }} else {[sender settitle:@] starts downloading "forstate:uicontrolstatenormal";        [Self.operation Cancel];    _operation = nil; }            }

-(unsigned long Long) Filesizeatpath: (NSString *) path{    unsigned long long fileSize = 0;    Nsfilemanager *filemanager = [Nsfilemanager Defaultmanager];    if ([FileManager Fileexistsatpath:path]) {        Nserror *error = nil;        Nsdictionary *dict = [FileManager attributesofitematpath:path error:&error];        if (dict &&!error) {            fileSize = [Dict fileSize];        }    }    return fileSize;}

The final effect is as follows:

Third-party data requests used: afnetworking, everyone should have, here do not introduce

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iOS breakpoints Download Han Junqiang's Blog