我正在嘗試PHAsset從用戶的照片庫中獲取一些照片 ( 's)，并將它們轉換為UIImage's.
下面是從庫中獲取資產的代碼：
func fetchPhotos() {
let fetchOptions = PHFetchOptions()
fetchOptions.predicate = NSPredicate(format: "(mediaSubtype & %d) != 0", PHAssetMediaSubtype.photoScreenshot.rawValue)
//Fetching Screen Shots
fetchedResult = PHAsset.fetchAssets(with: .image, options: fetchOptions)
let f: FetchResult = FetchResult(fetchedResult!)
var fetchCount = 0
for i in f {
fetchCount = 1
print("Fetch count \(fetchCount)")
let img = i.getAssetThumbnail()
testImages.append(img)
}
}
下面是從 a 中獲取 a 的UIImage代碼PHAsset：
extension PHAsset {
func getAssetThumbnail() -> UIImage {
let manager = PHImageManager.default()
let option = PHImageRequestOptions()
var thumbnail = UIImage()
option.isSynchronous = true
manager.requestImage(for: self,
targetSize: CGSize(width: self.pixelWidth, height: self.pixelHeight),
contentMode: .aspectFit,
options: option,
resultHandler: {(result, info) -> Void in
thumbnail = result!
})
return thumbnail
}
}
我目前在嘗試運行代碼時收到此崩潰輸出：
Details
The app “AppClassificationDemo” on Nick’s iPhone quit unexpectedly.
Domain: IDEDebugSessionErrorDomain
Code: 11
Failure Reason: Message from debugger: Terminated due to memory issue
User Info: {
DVTErrorCreationDateKey = "2022-11-14 22:19:19 0000";
IDERunOperationFailingWorker = DBGLLDBLauncher;
}
--
Analytics Event: com.apple.dt.IDERunOperationWorkerFinished : {
"device_model" = "iPhone14,2";
"device_osBuild" = "16.1.1 (20B101)";
"device_platform" = "com.apple.platform.iphoneos";
"launchSession_schemeCommand" = Run;
"launchSession_state" = 2;
"launchSession_targetArch" = arm64;
"operation_duration_ms" = 6369;
"operation_errorCode" = 11;
"operation_errorDomain" = IDEDebugSessionErrorDomain;
"operation_errorWorker" = DBGLLDBLauncher;
"operation_name" = IDEiPhoneRunOperationWorkerGroup;
"param_consoleMode" = 0;
"param_debugger_attachToExtensions" = 0;
"param_debugger_attachToXPC" = 1;
"param_debugger_type" = 5;
"param_destination_isProxy" = 0;
"param_destination_platform" = "com.apple.platform.iphoneos";
"param_diag_MainThreadChecker_stopOnIssue" = 0;
"param_diag_MallocStackLogging_enableDuringAttach" = 0;
"param_diag_MallocStackLogging_enableForXPC" = 1;
"param_diag_allowLocationSimulation" = 1;
"param_diag_checker_tpc_enable" = 1;
"param_diag_gpu_frameCapture_enable" = 0;
"param_diag_gpu_shaderValidation_enable" = 0;
"param_diag_gpu_validation_enable" = 0;
"param_diag_memoryGraphOnResourceException" = 0;
"param_diag_queueDebugging_enable" = 1;
"param_diag_runtimeProfile_generate" = 0;
"param_diag_sanitizer_asan_enable" = 0;
"param_diag_sanitizer_tsan_enable" = 0;
"param_diag_sanitizer_tsan_stopOnIssue" = 0;
"param_diag_sanitizer_ubsan_stopOnIssue" = 0;
"param_diag_showNonLocalizedStrings" = 0;
"param_diag_viewDebugging_enabled" = 1;
"param_diag_viewDebugging_insertDylibOnLaunch" = 1;
"param_install_style" = 0;
"param_launcher_UID" = 2;
"param_launcher_allowDeviceSensorReplayData" = 0;
"param_launcher_kind" = 0;
"param_launcher_style" = 0;
"param_launcher_substyle" = 0;
"param_runnable_appExtensionHostRunMode" = 0;
"param_runnable_productType" = "com.apple.product-type.application";
"param_runnable_type" = 2;
"param_testing_launchedForTesting" = 0;
"param_testing_suppressSimulatorApp" = 0;
"param_testing_usingCLI" = 0;
"sdk_canonicalName" = "iphoneos16.1";
"sdk_osVersion" = "16.1";
"sdk_variant" = iphoneos;
}
--
System Information
macOS Version 13.0.1 (Build 22A400)
Xcode 14.1 (21534.1) (Build 14B47b)
Timestamp: 2022-11-14T14:19:19-08:00
我相當確定它是生成的影像縮略圖的大小；當我設定width和height都為 100 時，處理按預期進行。
更改它self.pixelWidth和self.pixelHeight時，應用程式崩潰。
uj5u.com熱心網友回復：
不要嘗試將 轉換PHAsset為UIImage并存盤在陣列中。因為UIImage將使用影像的全部記憶體大小。所以陣列中的影像太多會導致記憶體泄漏。
因此，只需PHAsset按需獲取所需的并UIImage在需要時請求。請看下面的例子。
func loadImageAt(_ index:Int) -> UIImage?{
let asset = fetchResult.object(at: index)
let manager = PHImageManager.default()
let option = PHImageRequestOptions()
var thumbnail:UIImage?
option.isSynchronous = true
manager.requestImage(for: asset,
targetSize: CGSize(width: asset.pixelWidth, height: asset.pixelHeight),
contentMode: .aspectFit,
options: option,
resultHandler: {(result, info) -> Void in
thumbnail = result
})
return thumbnail
}
此外，我建議您使用異步影像請求來避免 UI 性能問題。
希望這可以幫助！
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標籤：ios迅速图像相位
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