iOS網絡編程使用代理方法 , 簡化請求和響應

jopen 8年前發布 | 4K 次閱讀 Objective-C IOS
//在此之前要遵守協議<NSURLConnectionDataDelegate>
import "ViewController.h"
import "Cricl.h"
@interface ViewController (){
    UITextField _textField;
    UIProgressView _progressView;
    UILabel _label;
    UIButton _button;
    Cricl cricl;
    long long _totalLength;
    NSMutableData _data;
    UIImageView imageOne;
    UIImageView imageTwo;
    UIImageView imageThree;
    UIButton buttonpause;
    BOOL num;
    NSTimer *timer;
}
@end
@implementation ViewController

(void)viewDidLoad {
  cricl = [[Cricl alloc]initWithFrame:CGRectMake(70,130, 375, 100)];
  cricl.backgroundColor = [UIColor colorWithRed:0.8 green:0.9 blue:0.8 alpha:0];
imageOne = [[UIImageView alloc]initWithFrame:CGRectMake(20, 300, 160, 120)];
  [self.view addSubview:imageOne];
  imageTwo = [[UIImageView alloc]initWithFrame:CGRectMake(195, 300, 160, 120)];
  [self.view addSubview:imageTwo];
  imageThree = [[UIImageView alloc]init];
[self.view addSubview:cricl];
  [super viewDidLoad];
  [self layout];//頁面布局
 }


-(void)layout{
    self.view.backgroundColor = [UIColor colorWithRed:0.8 green:0.9 blue:0.8 alpha:1];
    //地址欄
    _textField = [[UITextField alloc]initWithFrame:CGRectMake(10, 50, 355, 25)];
    _textField.borderStyle = UITextBorderStyleRoundedRect;//文本框邊框樣式(圓弧)
    _textField.text = @"http://i-7.vcimg.com/trim/f7a6fc6ebf36475798dd3bf726288d5988839/trim.jpg&quot;;
    [self.view addSubview:_textField];

_label = [[UILabel alloc]initWithFrame:CGRectMake(10, 110, 80, 25)];

//    _label.backgroundColor = [UIColor colorWithRed:0.8 green:0.9 blue:0.8 alpha:0.6];
    _label.text = @"正在下載";
    _label.font = [UIFont fontWithName:@"Arial" size:20];
    [self.view addSubview:_label];

_progressView = [[UIProgressView alloc]initWithFrame:CGRectMake(30, 400, 335, 25)];

//    [self.view addSubview:_progressView];

_button.layer.backgroundColor = [UIColor blackColor].CGColor;
_button = [[UIButton alloc]initWithFrame:CGRectMake(10, 500, 355, 25)];
[_button setTitle:@"下載" forState:UIControlStateNormal];
_button.backgroundColor = [UIColor colorWithRed:0.8 green:0.5 blue:0.7 alpha:0.6];
[_button addTarget:self action:@selector(choose) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:_button];

buttonpause = [[UIButton alloc]initWithFrame:CGRectMake(20, 600, 60, 25)];
buttonpause.backgroundColor = [UIColor colorWithRed:0.8 green:0.5 blue:0.7 alpha:0.6];
[buttonpause setTitle:@"暫停" forState:UIControlStateNormal];
[buttonpause addTarget:self action:@selector(okpause) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:buttonpause];

}
pragma mark 更新進度條
-(void)updateProgress{
    if(_data.length == _totalLength){
        _label.text = @"下載完成";
    }
    else{
        _label.text = @"正在下載";
    }
    cricl.value = (float)_data.length/_totalLength2M_PI;
}
pragma mark 發送數據請求
-(void)choose{
    NSLog(@"下載中...");
    NSString *urlStr;
    if(num){
         urlStr= @"http://i-7.vcimg.com/trim/867a1fe997bf3baeebbd223ae9aecdc8142598/trim.jpg&quot;;
    }
    else{
        urlStr=@"http://i-7.vcimg.com/trim/f7a6fc6ebf36475798dd3bf726288d5988839/trim.jpg&quot;;
    }
    //對于url中的中文是無法解析的，需要進行url編碼
    urlStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
//    urlStr = [urlStr stringByAddingPercentEncodingWithAllowedCharacters:NSCharacterSetURLQueryAllow]
//創建url鏈接
    NSURL url = [NSURL URLWithString:urlStr];
    //創建請求request
    NSURLRequest request = [[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:15.0f];
    //創建鏈接
    NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request delegate:self];
    //啟動連接
    [connection start];
}
pragma mark －開始代理方法
pragma mark －開始響應
-(void)connection:(NSURLConnection )connection didReceiveResponse:(NSURLResponse )response{
    NSLog(@"接收響應");
    _data = [[NSMutableData alloc]init];
    //初始化，設置進度條進度
    cricl.value = 0;
    //處理響應
    NSLog(@"%@",response);
    //通過響應頭中的content－Length取得整個響應的總長度
    NSHTTPURLResponse httpResponse = (NSHTTPURLResponse )response;
    NSDictionary *HeaderFields = [httpResponse allHeaderFields];
    NSLog(@"%@",HeaderFields);

_totalLength = [HeaderFields[@"Content-Length"] longLongValue];

//    NSLog(@"%lld",_totalLength);
}
pragma mark 接收響應數據
-(void)connection:(NSURLConnection )connection didReceiveData:(NSData )data{
    NSLog(@"接收響應數據");
    [_data appendData:data];
    //更新進度條
    [self updateProgress];
}
pragma mark 數據接收完成
-(void)connectionDidFinishLoading:(NSURLConnection )connection{
    NSLog(@"數據接收完成");
    //數據接收完保存文件（注意蘋果官方要求:下載數據智能保存到緩存目錄）
    NSString path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
    NSLog(@"%@",path);
    path=[path stringByAppendingPathComponent:@"下載圖片01.jpg"];
    //保存下載內容
    [_data writeToFile:path atomically:YES];
    if(num){
        imageOne.image = [UIImage imageWithData:_data];
        num = NO;
    }
    else{
        imageTwo.image = [UIImage imageWithData:_data];
        num = YES;

}
timer = [NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(convert) userInfo:nil repeats:YES];

}
pragma mark 請求失敗
-(void)connection:(NSURLConnection )connection didFailWithError:(NSError )error{
    NSLog(@"請求失敗:%@",error);
}
-(void)okpause{
    [timer invalidate];
    timer = nil;
}
-(void)convert{
    NSDate *date = [[NSDate alloc]init];
    imageThree.image = imageOne.image;
    imageOne.image = imageTwo.image;
    imageTwo.image = imageThree.image;
    NSLog(@"%@",date);
}
import "Cricl.h"
@implementation Cricl

(void)drawRect:(CGRect)rect {
  CGContextRef context = UIGraphicsGetCurrentContext();
  [self drawArc:context];
}

-(void)setValue:(float)value{
    _value = value;
    [self setNeedsDisplay];
}
-(void)drawArc:(CGContextRef)context{
    CGContextMoveToPoint(context, 220/2.0, 100/2.0);
    [[UIColor redColor]set];
    CGContextAddArc(context, 220/2.0, 100/2.0, 100/2.0, 0, _value, 0);
    CGContextDrawPath(context, kCGPathFillStroke);
}
@end
//簡化請求和響應
import "ViewController.h"
@interface ViewController (){
    UILabel _label;
    UIButton _button;
    UITextField _field;
    long long _totalLength;
    UIImageView imageOne;
    UIImageView *imageTwo;
    BOOL num;
}
@end
@implementation ViewController

(void)viewDidLoad {
  [super viewDidLoad];
  [self layout];
}
-(void)layout{
  imageOne =[[UIImageView alloc]initWithFrame:CGRectMake(20, 300, 100, 100)];
  [self.view addSubview:imageOne];
imageTwo = [[UIImageView alloc]initWithFrame:CGRectMake(150, 300, 100, 100)];
  [self.view addSubview:imageTwo];



_field = [[UITextField alloc]initWithFrame:CGRectMake(10, 50, 355, 25)];
_field.borderStyle = UITextBorderStyleRoundedRect;
_field.text = @"http://5.26923.com/download/pic/000/328/ba80a24af0d5aba07e1461eca71f9502.jpg";
[self.view addSubview:_field];

_label = [[UILabel alloc]initWithFrame:CGRectMake(10, 90, 100, 25)];
_label.text = @"圖片";
[self.view addSubview:_label];

_button = [[UIButton alloc]initWithFrame:CGRectMake(10,500, 355, 25)];
_button.backgroundColor = [UIColor colorWithRed:0.8 green:0.9 blue:0.8 alpha:0.6];
[_button setTitle:@"正在下載" forState:UIControlStateNormal];
[_button addTarget:self action:@selector(sendRequst) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:_button];

}
-(void)sendRequst{
    //發送網址，并將其轉換成utf8網絡字節序
    NSString urlStr = _field.text;
    NSLog(@"xxxx%@",urlStr);
    urlStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    //連接與網絡
    NSURL url = [NSURL URLWithString:urlStr];
    //發送請求和網絡
    NSURLRequest request = [[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10.0f];
    //同步所表示文件原件的發送必須到達才可執行下一步，異步可以進行后臺
    //發送異步請求
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse response, NSData data, NSError connectionError) {
        NSString *path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
        NSLog(@"%@",path);

    path = [path stringByAppendingPathComponent:@"圖片01.jpg"];
    [data writeToFile:path atomically:YES];
    NSLog(@"%i",num);
    if(num){
            imageOne.image = [UIImage imageWithData:data];
              num = NO;

        }else{
            imageTwo.image = [UIImage imageWithData:data];
            num= YES;
        }

}];


}
</pre>
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iOS網絡編程使用代理方法 , 簡化請求和響應

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