Bug之DidReceiveMemoryWarning

本文针对iOS应用中图片资源导致的内存消耗问题提出了解决方案,包括图片压缩、不同场景下图片加载方式的选择,以及在ViewController中释放资源的具体实现。

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DidReceiveMemoryWarning

##检查图片
题外话: 之前 没怎么注意图片,这次设计把图片给我,运行在App中,只要加载一个VC,memory消耗就会增加很多,当循环播放一个图片动画时,接收到DidReceiveMemoryWarning的警告。后来看了之前iPad项目中一个背景图片大小为200多k,现在都2M了
解决方式:
1.在图好快网站对图片进行压缩。这样就符合要求了。
2.在App经常用的图片使用background.image = UIImage(named: “background_answer”)
在app的某个界面用几次或一次就不用的 ,使用UIImage(contentsOfFile:NSBundle.mainBundle().pathForResource(“background_answer”, ofType: “png”)! )

##检查ViewController
在ViewController中接收到

   override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
        debugPrint("answer ReceiveMemoryWarning")

        if  self.view.window == nil {
            if self.view != nil{
            for v in self.self.view.subviews {
                v.removeFromSuperview()
            }
            self.view = nil
           // 目的是再次进入时能够重新加载调用viewDidLoad函数。
            }
        }
    }

###检查动画
viewDidDisappear中 动画记得移除,播放声音的AV记得stop,设置delegate = nil ,置空
###检查View
viewDidDisappear中 view 移除,并置空

如有错误请指正。希望大家给出其他意见,

#pragma mark -- UIImagePickerControllerDelegate- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{ UIImage *pickImage = info[UIImagePickerControllerOriginalImage]; CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:@{CIDetectorAccuracy: CIDetectorAccuracyHigh}]; // 获取选择图片中识别结果 NSArray *features = [detector featuresInImage:[CIImage imageWithData:UIImagePNGRepresentation(pickImage)]]; [picker dismissViewControllerAnimated:YES completion:^{ if (features.count > 0) { CIQRCodeFeature *feature = features[0]; NSString *stringValue = feature.messageString; [self handleScanValue:stringValue]; } else { [self readFromAlbumFailed]; } }];}- (void)changeVideoScale:(AVMetadataMachineReadableCodeObject *)objc { NSArray *array = objc.corners; CGPoint point = CGPointZero; int index = 0; CFDictionaryRef dict = (__bridge CFDictionaryRef)(array[index++]); // 把点转换为不可变字典 // 把字典转换为点,存在point里,成功返回true 其他false CGPointMakeWithDictionaryRepresentation(dict, &point); NSLog(@"X:%f -- Y:%f",point.x,point.y); CGPoint point2 = CGPointZero; CGPointMakeWithDictionaryRepresentation((__bridge CFDictionaryRef)array[2], &point2); NSLog(@"X:%f -- Y:%f",point2.x,point2.y); NSLog(@"bounds:%@",NSStringFromCGRect(objc.bounds));}#pragma mark -- App 从后台进入前台- (void)appDidBecomeActive:(NSNotification *)notify { [self resumeScanning];}#pragma mark -- App 从前台进入后台- (void)appWillResignActive:(NSNotification *)notify { [self pauseScanning];}/** 恢复扫一扫功能 */- (void)resumeScanning { if (self.session) { [self.session startRunning]; [self.scannerView startLineAnimation]; }}/** 暂停扫一扫 */- (void)pauseScanning { if (self.session) { [self.session stopRunning]; [self.scannerView stopLineAnimation]; }}#pragma mark -- 扫一扫API/** 处理扫一扫结果 @param value 扫描结果 */- (void)handleScanValue:(NSString *)value { NSLog(@"handleScanValue === %@", value);}/** 相册选取图片无法读取数据 */- (void)readFromAlbumFailed { NSLog(@"readFromAlbumFailed");}- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}@end12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697989910010110210310410510610710810911011111211311411511611711811912012112212312412512612712812913013113213313413513613713813914014114214314414514614714814915015115215315415515615715815916016116216316416516616716816917017117217317417517617717817918018118218318418518618718818919019119219319419519619719819
最新发布
04-03
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