最簡單的進程間的數(shù)據(jù)共享App Groups
此事例對應(yīng)屏幕共享數(shù)據(jù)傳輸、使用時請酌情處理

App Groups創(chuàng)建

創(chuàng)建

按順序點擊

新建及選擇

哪些應(yīng)用需要共享同一份數(shù)據(jù)就把他們的App Groups設(shè)置成同一個

擴展中使用

那么數(shù)據(jù)要怎么保存和使用呢？

數(shù)據(jù)讀寫1_UserDefaults

//讀取
-(void)getDataWithUserDefaults{
    //初始化一個供App Groups使用的NSUserDefaults對象
    NSUserDefaults *userDefaults = [[NSUserDefaults standardUserDefaults] initWithSuiteName:@"group.tongxun_xiaolang"];
    NSLog(@"%@", [userDefaults valueForKey:@"buffer"]);
}
//寫入
- (void)saveNSDataWithUserDefaults:(NSData*)data{
    NSUserDefaults *shared = [[NSUserDefaults standardUserDefaults]     initWithSuiteName:@"group.tongxun_xiaolang"];
    [shared setObject:data forKey:@"buffer"];
    [shared synchronize];
}

數(shù)據(jù)讀寫2_FileManager

//讀取
-(void)getDataWithFileManager{
    NSError *err = nil;
    NSURL *containerURL = [[NSFileManager defaultManager] containerURLForSecurityApplicationGroupIdentifier:@"group.tongxun_xiaolang"];
    containerURL = [containerURL URLByAppendingPathComponent:@"Library/Caches/data"];
    NSString *value = [NSString stringWithContentsOfURL:containerURL encoding:NSUTF8StringEncoding error:&err];
    NSData *data = [value dataUsingEncoding:NSUTF8StringEncoding];

    if (err != nil) {
        NSLog(@"xxxx %@",err);
        return;
    }
    NSLog(@"----%@",data);
}
//寫入
- (void)saveNSDataWithFileManager:(NSData*)data{
    NSError *err = nil;
    NSURL *containerURL = [[NSFileManager defaultManager] containerURLForSecurityApplicationGroupIdentifier:@"group.tongxun_xiaolang"];
    containerURL = [containerURL URLByAppendingPathComponent:@"Library/Caches/data"];
    NSString *dataString = [[NSString alloc] initWithData:data encoding:kCFStringEncodingUTF8];
    [dataString writeToURL:containerURL atomically:YES encoding:NSUTF8StringEncoding error:&err];
}

CMSampleBufferRef轉(zhuǎn)NSData

- (NSData *)dataWithSampBuffer:(CMSampleBufferRef)sampBuffer { CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampBuffer);
    CVPixelBufferLockBaseAddress(imageBuffer,0);
    size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
    size_t width = CVPixelBufferGetWidth(imageBuffer);
    size_t height = CVPixelBufferGetHeight(imageBuffer);
    void *src_buff = CVPixelBufferGetBaseAddress(imageBuffer);
    NSData *data = [NSData dataWithBytes:src_buff length:bytesPerRow * height];
    CVPixelBufferUnlockBaseAddress(imageBuffer, 0);
    return data;
}