NSURLConnection下载文件

#import "ViewController.h"    @interface ViewController ()  {      UITextField *textField;      UIButton *button;      UILabel *label;      UILabel *label1;      UIImageView *image1;      UIImageView *image2;      UIButton *button1;      int flag;  }  @end    @implementation ViewController    - (void)viewDidLoad {      [super viewDidLoad];            flag = 1;      [self layout];    }  -(void)layout{      //地址栏      textField = [[UITextField alloc]initWithFrame:CGRectMake(10, 40, 355, 35)];      textField.layer.borderWidth = 2;      textField.layer.borderColor = [UIColor blackColor].CGColor;      textField.layer.cornerRadius = 7;      textField.textAlignment = NSTextAlignmentCenter;      textField.backgroundColor = [UIColor whiteColor];      textField.text = @"http://c.hiphotos.baidu.com/zhidao/pic/item/b219ebc4b74543a930b783631e178a82b80114f4.jpg";      button = [[UIButton alloc]initWithFrame:CGRectMake(30, 630, 315, 27)];      [button setTitle:@"下载" forState:UIControlStateNormal];      [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];      button.layer.borderColor = [UIColor purpleColor].CGColor;      button.layer.borderWidth = 2;      button.layer.cornerRadius = 7;      [button addTarget:self action:@selector(sendRequest) forControlEvents:UIControlEventTouchUpInside];      label = [[UILabel alloc]initWithFrame:CGRectMake(10, 90, 70, 30)];      label.layer.borderWidth = 2;      label.layer.borderColor = [UIColor purpleColor].CGColor;      label.layer.cornerRadius = 7;      label.text = @"One";      label.textAlignment = NSTextAlignmentCenter;      label1 = [[UILabel alloc]initWithFrame:CGRectMake(10, 323, 70, 30)];      label1.layer.borderWidth = 2;      label1.layer.borderColor = [UIColor purpleColor].CGColor;      label1.layer.cornerRadius = 7;      label1.text = @"Two";      label1.textAlignment = NSTextAlignmentCenter;        image1 = [[UIImageView alloc]initWithFrame:CGRectMake(0, 122, 375, 200)];      image1.backgroundColor = [UIColor brownColor];      image2 = [[UIImageView alloc]initWithFrame:CGRectMake(0, 354, 375, 220)];      image2.backgroundColor = [UIColor brownColor];      button1 = [[UIButton alloc]initWithFrame:CGRectMake(30, 600, 315, 27)];      [button1 setTitle:@"清空" forState:UIControlStateNormal];      [button1 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];      button1.layer.borderColor = [UIColor purpleColor].CGColor;      button1.layer.borderWidth = 2;      button1.layer.cornerRadius = 7;      [button1 addTarget:self action:@selector(clean) forControlEvents:UIControlEventTouchUpInside];        [self.view addSubview:label];      [self.view addSubview:label1];      [self.view addSubview:textField];      [self.view addSubview:button1];      [self.view addSubview:button];      [self.view addSubview:image2];      [self.view addSubview:image1];        }  -(void)sendRequest{      NSString *urlStr = textField.text;      //转换格式      urlStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];      //创建url      NSURL *url = [NSURL URLWithString:urlStr];      //创建网络请求      NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:15];      //获得数据      [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {          //创建储存路径将文件存入          NSString *path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)lastObject];          path = [path stringByAppendingPathComponent:@"图片007.jpg"];          [data writeToFile:path atomically:YES];                    if (flag%2==0) {                            image2.image = [UIImage imageWithData:data];          }          else {              image1.image = [UIImage imageWithData:data];          }                    flag++;      }];              }  -(void)clean{      image2.image = nil;      image1.image = nil;      textField.text = nil;  }    - (void)didReceiveMemoryWarning {      [super didReceiveMemoryWarning];      // Dispose of any resources that can be recreated.  }    @end
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NSURLConnection下载文件
