Question

我有从mjpeg-iphone下载的MjpegView（在mjpeg-iphone项目中，它被命名为MJPEGClient，我将其重命名为MjpegView以便更容易理解它的功能）

基本上，MjpegView是UIImageView的扩展，并使用NSUrlConnection从url获取mjpeg图像。我将UITapGestureRecognizer添加到MjpegView，但是当我点击时它没有响应。

MjpegView的代码片段如下：

@interface MjpegView : UIImageView
@end

@implementation MjpegView

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];

    if (self) {

        if (_endMarkerData == nil) {
            uint8_t endMarker[2] = END_MARKER_BYTES;
            _endMarkerData = [[NSData alloc] initWithBytes:endMarker length:2];
        }

        self.contentMode = UIViewContentModeScaleAspectFit;

        singleTapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onSingleTap:)];
        singleTapRecognizer.numberOfTapsRequired = 1;
        singleTapRecognizer.numberOfTouchesRequired = 1;

        [self addGestureRecognizer:singleTapRecognizer];

       [[NSURLConnection alloc] initWithRequest:[NSURLRequest requestWithURL:_url] delegate:self];
    }

    return self;
}


#pragma mark - NSURLConnection Delegate Methods

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    //NSLog(@"didReceiveResponse");

    if (_receivedData) {
        [_receivedData release];
    }

    _receivedData = [[NSMutableData alloc] init];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    //NSLog(@"didReceiveData");

    [_receivedData appendData:data];

    NSRange endRange = [_receivedData rangeOfData:_endMarkerData 
                                          options:0 
                                            range:NSMakeRange(0, _receivedData.length)];

    long long endLocation = endRange.location + endRange.length;
    if (_receivedData.length >= endLocation) {
        NSData *imageData = [_receivedData subdataWithRange:NSMakeRange(0, endLocation)];
        UIImage *receivedImage = [UIImage imageWithData:imageData];
        if (receivedImage) {
            self.image = receivedImage;
        }
    }
}

@end

我怀疑是因为主线程忙于用mpjeg图像更新视图，因此无法检测到点击。有人建议如何实现这个吗？

Answer 1

默认情况下，UIImageView userInteractionEnabled为假

设置属性userInteractionEnabled= YES

试试这个，

@implementation MjpegView

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];

    if (self) {

        if (_endMarkerData == nil) {
            uint8_t endMarker[2] = END_MARKER_BYTES;
            _endMarkerData = [[NSData alloc] initWithBytes:endMarker length:2];
        }

        self.contentMode = UIViewContentModeScaleAspectFit;
        self.userInteractionEnabled=YES;

        singleTapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onSingleTap:)];
        singleTapRecognizer.numberOfTapsRequired = 1;
        singleTapRecognizer.numberOfTouchesRequired = 1;

        [self addGestureRecognizer:singleTapRecognizer];

       [[NSURLConnection alloc] initWithRequest:[NSURLRequest requestWithURL:_url] delegate:self];
    }

    return self;
}

MjpegView没有响应UITapGestureRecognizer

1 个答案: