下载器

//

//  ViewController.m

//  NSConnection-0805

//

//  Created by apple on 14-8-5.

//  Copyright (c) 2014年 apple. All rights reserved.

//



#import "ViewController.h"



@interface ViewController ()<NSURLConnectionDataDelegate>

{

    NSMutableData *_totalData;

    long long _totalDataLenth;

    NSFileHandle *_fileHandle;

    NSURL *_url;

    NSURLConnection *_connection;

}

@property(nonatomic,strong)UIProgressView *progressView;

@property(nonatomic,strong)UITextField *urlTextField;

@end



@implementation ViewController

            

- (void)viewDidLoad {

    [super viewDidLoad];

    _totalData=[[NSMutableData alloc]init];

    self.view.backgroundColor=[UIColor greenColor];

    //进度条的创建

    _progressView=[[UIProgressView alloc]initWithProgressViewStyle:UIProgressViewStyleDefault];

    _progressView.frame=CGRectMake(70, 150, 150, 20);

    _progressView.progressTintColor=[UIColor blueColor];

    [self.view addSubview:_progressView];

    

    //URL输入栏

    _urlTextField=[[UITextField alloc]initWithFrame:CGRectMake(40, 200, 200, 30)];

    _urlTextField.backgroundColor=[UIColor whiteColor];

    [self.view addSubview:_urlTextField];

    

    //创建下载按钮

    UIButton *downLoad=[UIButton buttonWithType:UIButtonTypeCustom];

    downLoad.frame=CGRectMake(100, 300, 120, 40);

    [downLoad setTitle:@"开始下载" forState:UIControlStateNormal];

    [downLoad addTarget:self action:@selector(down) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:downLoad];

    

    

    NSFileManager *fileManager=[NSFileManager defaultManager];

    [fileManager createFileAtPath:@"/Users/apple/Desktop/test1.mp4" contents:nil attributes:nil];

    _fileHandle=[NSFileHandle fileHandleForWritingAtPath:@"/Users/apple/Desktop/test1.mp4"] ;

//    _url=[NSURL URLWithString:@"http://class.room/hdmv.mp4"];



//    NSURLRequest *request=[NSURLRequest requestWithURL:_url];

//    NSURLConnection *connection=[NSURLConnection connectionWithRequest:request delegate:self];

//    [connection start];

//    _connection=[[NSURLConnection alloc]initWithRequest:request delegate:self];

    

}



//按钮方法

- (void)down

{

    

    [_fileHandle truncateFileAtOffset:0];

    _url=[NSURL URLWithString:_urlTextField.text];

    NSURLRequest *request=[NSURLRequest requestWithURL:_url];

    //    NSURLConnection *connection=[NSURLConnection connectionWithRequest:request delegate:self];

    //    [connection start];

    _connection=[[NSURLConnection alloc]initWithRequest:request delegate:self];

    //开始下载

    [_connection start];

//    [_connection cancel];

}



//连接失败响应方法

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error

{

    NSLog(@"connection fail %@",error);

}



- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response

{

    NSLog(@"Response%@",response);

    _totalDataLenth=[response expectedContentLength];

}



- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

{

    NSLog(@"接收数据");

//    [_totalData appendData:data];

    [_fileHandle writeData:data];

//    NSLog(@"==%d",[_totalData length]);

    NSLog(@"data %f",(float)[_fileHandle offsetInFile]/_totalDataLenth);

    _progressView.progress=(float)[_fileHandle offsetInFile]/_totalDataLenth;

}



//连接完成

- (void)connectionDidFinishLoading:(NSURLConnection *)connection

{

    NSLog(@"connection finished");

    [_fileHandle closeFile];

}



- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}



@end