使用NSURLConnection創建顯示狀態下載文件的動態UILabel

Question

我創建了一個具有一個頁面的應用程序。在該頁面中有一個按鈕，標籤&一個progressview。我想要的是點擊按鈕時開始下載，並顯示標籤狀態下載進度&。

我可以製作progressview，但我無法制作顯示下載狀態的標籤。

例如，我希望我的標籤顯示"12 MB downloaded of 100 MB"

這是我的代碼：

視圖或者Controller.h

@interface ViewController : UIViewController 
{ 
    float expectedBytes; 
} 
@property (weak,nonatomic) IBOutlet UIProgressView *progressView; 
@property (strong,nonatomic) IBOutlet UIButton *download; 
- (IBAction)download:(id)sender; 

@end 

視圖Controller.m或者

@implementation ViewController 
{ 
    NSMutableData *receivedData; 
    NSString *currentURL; 
    NSString *name; 
} 
- (void)viewDidLoad 
{ 
    currentURL = @"http://192.168.1.100/mamal/Adele%20-%20Someone%20Like%20You%20(MTV%20Video%20Music%20Awards%202011)%20HD%20Live.mkv"; 
    name = [currentURL lastPathComponent]; 
    [super viewDidLoad]; 
} 
@synthesize progressView,download; 
-(IBAction)download:(id)sender 
{ 
    NSString* documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; 
    NSString* foofile = [documentsPath stringByAppendingPathComponent:name]; 
    BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:foofile]; 
    if (!fileExists) 
    { 
     [self downloadWithNsurlconnection]; 
    } 
    else 
    { 
     NSLog(@"FILE EXIST"); 
    } 
} 
-(void)downloadWithNsurlconnection 
{ 
    NSURL *url = [NSURL URLWithString:currentURL]; 
    NSURLRequest *theRequest = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:600]; 
    receivedData = [[NSMutableData alloc] initWithLength:0]; 
    NSURLConnection * connection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self startImmediately:YES]; 
    [connection start]; 

} 


- (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { 
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES; 
    progressView.hidden = NO; 
    [receivedData setLength:0]; 
    expectedBytes = [response expectedContentLength]; 
} 

- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { 
    [receivedData appendData:data]; 
    float progressive = (float)[receivedData length]/(float)expectedBytes; 
    [progressView setProgress:progressive]; 
} 

- (void) connectionDidFinishLoading:(NSURLConnection *)connection { 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSLog(@"%@",paths); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; 
    NSString *pdfPath = [documentsDirectory stringByAppendingPathComponent:name]; 
    NSLog(@"Succeeded! Received %d bytes of data",[receivedData length]); 
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; 
    [receivedData writeToFile:pdfPath atomically:YES]; 
} 

請指導我如何在UILabel與NSURLConnection下載顯示狀態。

Answer 1

把這個語法.h文件中

@property (weak,nonatomic) IBOutlet UILabel *label; 

然後在.m文件中輸入

- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { 
    [receivedData appendData:data]; 
    float progressive = (float)[receivedData length]/(float)expectedBytes; 
    [progressView setProgress:progressive]; 
    [lable setText:[NSString stringWithFormat:@"%u MB of %f MB",[receivedData length],expectedBytes]]; 

} 

Answer 2

爲標籤創建一個出口

@property (weak,nonatomic) IBOutlet UILabel *label; 

然後在

- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { 
    [receivedData appendData:data]; 
    float progressive = (float)[receivedData length]/(float)expectedBytes; 
    [progressView setProgress:progressive]; 
    [lable setText:[NSString stringWithFormat:@"%u MB of %f MB",[receivedData length],expectedBytes]]; 
} 

你可以改變字節到MB