NSURLConnection下載文件

flkt9867 8年前發布 | 4K 次閱讀 C/C++ Objective-C 

#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{
    //地址欄
    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 = @"

    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;
    //轉換格式
    urlStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    //創建url
    NSURL url = [NSURL URLWithString:urlStr];
    //創建網絡請求
    NSURLRequest request = [[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:15];
    //獲得數據
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse  _Nullable response, NSData  _Nullable data, NSError  _Nullable connectionError) {
        //創建儲存路徑將文件存入
        NSString *path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)lastObject];
        path = [path stringByAppendingPathComponent:@"圖片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</pre>
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