Ios 如何在表格单元格中显示进度？

我从服务器下载了一个文件。文件下载时，我想在表格单元格中显示进度百分比。我该怎么做

下载文件代码

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"01.mp3"];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:filePath isDirectory:NO];

if (!fileExists) {

    NSString *stringURL = @"https://drive.google.com/uc?export=download&id=0B6zMam2kAK39X0FOaUJXVDUwOHc";
    NSURL  *url = [NSURL URLWithString:stringURL];
    NSData *urlData = [NSData dataWithContentsOfURL:url];
    [urlData writeToFile:filePath atomically:YES];

}
});
self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL URLWithString:filePath] error:nil];
}

---

这在

[NSData dataWithContentsOfUrl]

中是不可能的。你需要一个图书馆，比如

---

请参阅

[NSData DATA with CONTENTS OFURL]

不可能实现的。你需要一个图书馆，比如

---

请参见创建自定义单元格XIB文件并在其上添加进度条

在视图控制器中开始下载，然后访问进度栏并在didReceiveData方法中设置进度

我刚刚在视图控制器中创建，您需要将其与表视图方法一起使用

代码示例：

   @interface ViewController ()<NSURLConnectionDataDelegate>

    //Put these in custom cell file
    @property (weak, nonatomic) IBOutlet UIProgressView *progressView;
    @property (weak, nonatomic) IBOutlet UIImageView *imageView;

    @property (strong, nonatomic) NSURLConnection *connectionManager;
    @property (strong, nonatomic) NSMutableData *downloadedMutableData;
    @property (strong, nonatomic) NSURLResponse *urlResponse;

    @end

    @implementation ViewController

    - (void)viewDidLoad
    {
        [super viewDidLoad];

        //Start download request logic
        self.downloadedMutableData = [[NSMutableData alloc] init];
        NSURLRequest *urlRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.planwallpaper.com/static/images/63906_1_BdhSun5.jpg"]
                                                    cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                                                timeoutInterval:60.0];
        self.connectionManager = [[NSURLConnection alloc] initWithRequest:urlRequest delegate:self];
    }



    #pragma mark - Delegate Methods
    -(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
        NSLog(@"%lld", response.expectedContentLength);
        self.urlResponse = response;
    }

//Show progress download while receiving data 
    -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
        [self.downloadedMutableData appendData:data];
        self.progressView.progress = ((100.0/self.urlResponse.expectedContentLength)*self.downloadedMutableData.length)/100;
        if (self.progressView.progress == 1) {
            self.progressView.hidden = YES;
        } else {
            self.progressView.hidden = NO;
        }
        NSLog(@"%.0f%%", ((100.0/self.urlResponse.expectedContentLength)*self.downloadedMutableData.length));
    }

    -(void)connectionDidFinishLoading:(NSURLConnection *)connection {
        NSLog(@"Finished");
        self.imageView.image = [UIImage imageWithData:self.downloadedMutableData];
    }

@界面视图控制器（）
//将这些放在自定义单元格文件中
@属性（弱、非原子）IBUIProgressView*progressView；
@属性（弱、非原子）IBUIImageView*imageView；
@属性（强，非原子）NSURLConnection*connectionManager；
@属性（强，非原子）NSMutableData*下载的MutableData；
@属性（强，非原子）NSURLSERPONSE*URLSERPONSE；
@结束
@实现视图控制器
-（无效）viewDidLoad
{
[超级视图下载]；
//启动下载请求逻辑
self.downloademdutabledata=[[NSMutableData alloc]init]；
NSURLRequest*urlRequest=[nsurlRequestRequestWithURL:[nsurlUrlWithString:@]https://www.planwallpaper.com/static/images/63906_1_BdhSun5.jpg"]
cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
timeoutInterval:60.0]；
self.connectionManager=[[NSURLConnection alloc]initWithRequest:urlRequest委托：self]；
}
#pragma标记-委托方法
-（void）连接：（NSURLConnection*）连接DidReceiverResponse：（NSURResponse*）响应{
NSLog（@“%lld”，response.expectedContentLength）；
self.urresponse=响应；
}
//接收数据时显示下载进度
-（void）连接：（NSURLConnection*）连接didReceiveData:（NSData*）数据{
[self.downloademdutabledata-appendData:data]；
self.progressView.progress=（（100.0/self.urresponse.expectedContentLength）*self.downloadedMutableData.length）/100；
if（self.progressView.progress==1）{
self.progressView.hidden=是；
}否则{
self.progressView.hidden=否；
}
NSLog（@“%.0f%%”，（（100.0/self.urresponse.expectedContentLength）*self.downloadedMutableData.length））；
}
-（无效）连接IDFinishLoading:（NSURLConnection*）连接{
NSLog（@“完成”）；
self.imageView.image=[UIImage imageWithData:self.downloadedMutableData]；
}

结果看起来像

---

创建自定义单元格XIB文件并在其上添加进度条

在视图控制器中开始下载，然后访问进度栏并在didReceiveData方法中设置进度

我刚刚在视图控制器中创建，您需要将其与表视图方法一起使用

代码示例：

   @interface ViewController ()<NSURLConnectionDataDelegate>

    //Put these in custom cell file
    @property (weak, nonatomic) IBOutlet UIProgressView *progressView;
    @property (weak, nonatomic) IBOutlet UIImageView *imageView;

    @property (strong, nonatomic) NSURLConnection *connectionManager;
    @property (strong, nonatomic) NSMutableData *downloadedMutableData;
    @property (strong, nonatomic) NSURLResponse *urlResponse;

    @end

    @implementation ViewController

    - (void)viewDidLoad
    {
        [super viewDidLoad];

        //Start download request logic
        self.downloadedMutableData = [[NSMutableData alloc] init];
        NSURLRequest *urlRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.planwallpaper.com/static/images/63906_1_BdhSun5.jpg"]
                                                    cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                                                timeoutInterval:60.0];
        self.connectionManager = [[NSURLConnection alloc] initWithRequest:urlRequest delegate:self];
    }



    #pragma mark - Delegate Methods
    -(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
        NSLog(@"%lld", response.expectedContentLength);
        self.urlResponse = response;
    }

//Show progress download while receiving data 
    -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
        [self.downloadedMutableData appendData:data];
        self.progressView.progress = ((100.0/self.urlResponse.expectedContentLength)*self.downloadedMutableData.length)/100;
        if (self.progressView.progress == 1) {
            self.progressView.hidden = YES;
        } else {
            self.progressView.hidden = NO;
        }
        NSLog(@"%.0f%%", ((100.0/self.urlResponse.expectedContentLength)*self.downloadedMutableData.length));
    }

    -(void)connectionDidFinishLoading:(NSURLConnection *)connection {
        NSLog(@"Finished");
        self.imageView.image = [UIImage imageWithData:self.downloadedMutableData];
    }

@界面视图控制器（）
//将这些放在自定义单元格文件中
@属性（弱、非原子）IBUIProgressView*progressView；
@属性（弱、非原子）IBUIImageView*imageView；
@属性（强，非原子）NSURLConnection*connectionManager；
@属性（强，非原子）NSMutableData*下载的MutableData；
@属性（强，非原子）NSURLSERPONSE*URLSERPONSE；
@结束
@实现视图控制器
-（无效）viewDidLoad
{
[超级视图下载]；
//启动下载请求逻辑
self.downloademdutabledata=[[NSMutableData alloc]init]；
NSURLRequest*urlRequest=[nsurlRequestRequestWithURL:[nsurlUrlWithString:@]https://www.planwallpaper.com/static/images/63906_1_BdhSun5.jpg"]
cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
timeoutInterval:60.0]；
self.connectionManager=[[NSURLConnection alloc]initWithRequest:urlRequest委托：self]；
}
#pragma标记-委托方法
-（void）连接：（NSURLConnection*）连接DidReceiverResponse：（NSURResponse*）响应{
NSLog（@“%lld”，response.expectedContentLength）；
self.urresponse=响应；
}
//接收数据时显示下载进度
-（void）连接：（NSURLConnection*）连接didReceiveData:（NSData*）数据{
[self.downloademdutabledata-appendData:data]；
self.progressView.progress=（（100.0/self.urresponse.expectedContentLength）*self.downloadedMutableData.length）/100；
if（self.progressView.progress==1）{
self.progressView.hidden=是；
}否则{
self.progressView.hidden=否；
}
NSLog（@“%.0f%%”，（（100.0/self.urresponse.expectedContentLength）*self.downloadedMutableData.length））；
}
-（无效）连接IDFinishLoading:（NSURLConnection*）连接{
NSLog（@“完成”）；
self.imageView.image=[UIImage imageWithData:self.downloadedMutableData]；
}

结果看起来像

---

如果我使用

NSURLRequest*urlRequest=[nsurlRequestRequestWithURL:[nsurlUrlWithString:@]https://drive.google.com/uc?export=download&id=0B6zMam2kAK39Zm5LUTctZXNLUlE»]

Progress不起作用。为什么？请看，我们需要一个委托方法来获取下载进度，所以我使用了NSURLConnection类，因为它具有didReceiveData委托方法，我在其中更新进度barif我使用

NSURLRequest*urlRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:@]https://drive.google.com/uc?export=download&id=0B6zMam2kAK39Zm5LUTctZXNLUlE»]

进度不起作用。为什么？请看，我们需要一个委托方法来获取下载进度，所以我使用了NSURLConnection