Question

以下是代码：

@objc func handleSwipe(_ sender: UIPanGestureRecognizer) {
    let translation = sender.translation(in: self.view)
    if sender.state == .began || sender.state == .changed {
        let c = self.cardView.frontCardConstraint.constant - translation.y
        if c < 35 && c >= 11 {
            self.cardView.frontCardConstraint.constant = c
            self.cardView.layoutIfNeeded()
        } else {
            //
        }
    } else if sender.state == .ended {
        //
    }
    sender.setTranslation(.zero, in: self.view)
}

它做我想要的，但是当快速拖动时，它显得非常迟钝。有什么我可以改变的，还是应该切换到自定义手势识别器？

Answer 1

尝试使用> org.gradle.api.UncheckedIOException: Failed to capture snapshot of > output files for task ':someTask' property 'destinationDir' > during up-to-date check. > at org.gradle.api.internal.changedetection.state.CacheBackedTaskHistoryRepository.snapshotTaskFiles(CacheBackedTaskHistoryRepository.java:329) > at org.gradle.api.internal.changedetection.state.CacheBackedTaskHistoryRepository.createExecution(CacheBackedTaskHistoryRepository.java:153) > at org.gradle.api.internal.changedetection.state.CacheBackedTaskHistoryRepository.access$100(CacheBackedTaskHistoryRepository.java:61) > at org.gradle.api.internal.changedetection.state.CacheBackedTaskHistoryRepository$1.getCurrentExecution(CacheBackedTaskHistoryRepository.java:111) > at org.gradle.api.internal.changedetection.changes.DefaultTaskArtifactStateRepository$TaskArtifactStateImpl.getStates(DefaultTaskArtifactStateRepository.java:203) > at org.gradle.api.internal.changedetection.changes.DefaultTaskArtifactStateRepository$TaskArtifactStateImpl.isUpToDate(DefaultTaskArtifactStateRepository.java:89) > at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:50) > at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:54) > at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:59) > at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:101) > at org.gradle.api.internal.tasks.execution.FinalizeInputFilePropertiesTaskExecuter.execute(FinalizeInputFilePropertiesTaskExecuter.java:44) > at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:88) > at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.java:62) > at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52) > at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:54) > at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43) > at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:34) > at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker$1.run(DefaultTaskGraphExecuter.java:248) > at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336) > at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328) > at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199) > at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110) > at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:241) > at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:230) > at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.processTask(DefaultTaskPlanExecutor.java:123) > at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.access$200(DefaultTaskPlanExecutor.java:79) > at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:104) > at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:98) > at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.execute(DefaultTaskExecutionPlan.java:623) > at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.executeWithTask(DefaultTaskExecutionPlan.java:578) > at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.run(DefaultTaskPlanExecutor.java:98) > at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:59) > at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:128) > at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:37) > at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37) > at org.gradle.execution.DefaultBuildExecuter.access$000(DefaultBuildExecuter.java:23) > at org.gradle.execution.DefaultBuildExecuter$1.proceed(DefaultBuildExecuter.java:43) > at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:46) > at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37) > at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:30) > at org.gradle.initialization.DefaultGradleLauncher$ExecuteTasks.run(DefaultGradleLauncher.java:318) > at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336) > at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328) > at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199) > at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110) > at org.gradle.initialization.DefaultGradleLauncher.runTasks(DefaultGradleLauncher.java:204) > at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:134) > at org.gradle.initialization.DefaultGradleLauncher.executeTasks(DefaultGradleLauncher.java:109) > at org.gradle.internal.invocation.GradleBuildController$1.call(GradleBuildController.java:78) > at org.gradle.internal.invocation.GradleBuildController$1.call(GradleBuildController.java:75) > at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:152) > at org.gradle.internal.invocation.GradleBuildController.doBuild(GradleBuildController.java:100) > at org.gradle.internal.invocation.GradleBuildController.run(GradleBuildController.java:75) > at org.gradle.tooling.internal.provider.ExecuteBuildActionRunner.run(ExecuteBuildActionRunner.java:28) > at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35) > at org.gradle.tooling.internal.provider.ValidatingBuildActionRunner.run(ValidatingBuildActionRunner.java:32) > at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner$1.run(RunAsBuildOperationBuildActionRunner.java:43) > at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336) > at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328) > at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199) > at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110) > at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner.run(RunAsBuildOperationBuildActionRunner.java:40) > at org.gradle.tooling.internal.provider.SubscribableBuildActionRunner.run(SubscribableBuildActionRunner.java:51) > at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:49) > at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:32) > at org.gradle.launcher.exec.BuildTreeScopeBuildActionExecuter.execute(BuildTreeScopeBuildActionExecuter.java:39) > at org.gradle.launcher.exec.BuildTreeScopeBuildActionExecuter.execute(BuildTreeScopeBuildActionExecuter.java:25) > at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:80) > at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:53) > at org.gradle.tooling.internal.provider.ServicesSetupBuildActionExecuter.execute(ServicesSetupBuildActionExecuter.java:57) > at org.gradle.tooling.internal.provider.ServicesSetupBuildActionExecuter.execute(ServicesSetupBuildActionExecuter.java:32) > at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:36) > at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:25) > at org.gradle.tooling.internal.provider.ParallelismConfigurationBuildActionExecuter.execute(ParallelismConfigurationBuildActionExecuter.java:43) > at org.gradle.tooling.internal.provider.ParallelismConfigurationBuildActionExecuter.execute(ParallelismConfigurationBuildActionExecuter.java:29) > at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:64) > at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:29) > at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:59) > at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:44) > at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execute(SetupLoggingActionExecuter.java:45) > at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execute(SetupLoggingActionExecuter.java:30) > at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBuild.java:67) > at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36) > at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122) > at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(WatchForDisconnection.java:37) > at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122) > at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute(ResetDeprecationLogger.java:26) > at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122) > at org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.execute(RequestStopIfSingleUsedDaemon.java:34) > at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122) > at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:74) > at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:72) > at org.gradle.util.Swapper.swap(Swapper.java:38) > at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(ForwardClientInput.java:72) > at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122) > at org.gradle.launcher.daemon.server.exec.LogAndCheckHealth.execute(LogAndCheckHealth.java:55) > at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122) > at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:62) > at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36) > at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122) > at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild(EstablishBuildEnvironment.java:82) > at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36) > at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122) > at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.run(StartBuildOrRespondWithBusy.java:50) > at org.gradle.launcher.daemon.server.DaemonStateCoordinator$1.run(DaemonStateCoordinator.java:295) > at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63) > at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46) > at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55) > Caused by: org.gradle.api.UncheckedIOException: Failed to create MD5 > hash for file content. > at org.gradle.internal.hash.DefaultStreamHasher.hash(DefaultStreamHasher.java:40) > at org.gradle.internal.hash.DefaultFileHasher.hash(DefaultFileHasher.java:40) > at org.gradle.api.internal.changedetection.state.CachingFileHasher.snapshot(CachingFileHasher.java:88) > at org.gradle.api.internal.changedetection.state.CachingFileHasher.snapshot(CachingFileHasher.java:75) > at org.gradle.api.internal.changedetection.state.CachingFileHasher.hash(CachingFileHasher.java:61) > at org.gradle.api.internal.changedetection.state.DefaultFileSystemSnapshotter.fileSnapshot(DefaultFileSystemSnapshotter.java:244) > at org.gradle.api.internal.changedetection.state.DefaultFileSystemSnapshotter.access$700(DefaultFileSystemSnapshotter.java:60) > at org.gradle.api.internal.changedetection.state.DefaultFileSystemSnapshotter$FileVisitorImpl.visitFile(DefaultFileSystemSnapshotter.java:297) > at org.gradle.api.internal.file.collections.jdk7.Jdk7DirectoryWalker$1.visitFile(Jdk7DirectoryWalker.java:86) > at org.gradle.api.internal.file.collections.jdk7.Jdk7DirectoryWalker$1.visitFile(Jdk7DirectoryWalker.java:59) > at org.gradle.api.internal.file.collections.jdk7.Jdk7DirectoryWalker.walkDir(Jdk7DirectoryWalker.java:59) > at org.gradle.api.internal.file.collections.DirectoryFileTree.walkDir(DirectoryFileTree.java:154) > at org.gradle.api.internal.file.collections.DirectoryFileTree.visitFrom(DirectoryFileTree.java:132) > at org.gradle.api.internal.file.collections.DirectoryFileTree.visit(DirectoryFileTree.java:117) > at org.gradle.api.internal.changedetection.state.DefaultFileSystemSnapshotter.snapshotAndCache(DefaultFileSystemSnapshotter.java:192) > at org.gradle.api.internal.changedetection.state.DefaultFileSystemSnapshotter.access$500(DefaultFileSystemSnapshotter.java:60) > at org.gradle.api.internal.changedetection.state.DefaultFileSystemSnapshotter$4.create(DefaultFileSystemSnapshotter.java:174) > at org.gradle.api.internal.changedetection.state.DefaultFileSystemSnapshotter$4.create(DefaultFileSystemSnapshotter.java:169) > at org.gradle.cache.internal.ProducerGuard$StripedProducerGuard.guardByKey(ProducerGuard.java:115) > at org.gradle.api.internal.changedetection.state.DefaultFileSystemSnapshotter.snapshotDirectoryTree(DefaultFileSystemSnapshotter.java:169) > at org.gradle.api.internal.changedetection.state.AbstractFileCollectionSnapshotter$FileCollectionVisitorImpl.visitDirectoryTree(AbstractFileCollectionSnapshotter.java:98) > at org.gradle.api.internal.changedetection.state.AbstractFileCollectionSnapshotter$FileCollectionVisitorImpl.visitCollection(AbstractFileCollectionSnapshotter.java:82) > at org.gradle.api.internal.file.AbstractFileCollection.visitRootElements(AbstractFileCollection.java:234) > at org.gradle.api.internal.file.CompositeFileCollection.visitRootElements(CompositeFileCollection.java:185) > at org.gradle.api.internal.changedetection.state.AbstractFileCollectionSnapshotter.snapshot(AbstractFileCollectionSnapshotter.java:53) > at org.gradle.api.internal.changedetection.state.DefaultGenericFileCollectionSnapshotter.snapshot(DefaultGenericFileCollectionSnapshotter.java:38) > at org.gradle.api.internal.changedetection.state.CacheBackedTaskHistoryRepository.snapshotTaskFiles(CacheBackedTaskHistoryRepository.java:327) > ... 107 more Caused by: java.io.IOException: The process cannot access the file because another process has locked a portion of > the file > at org.gradle.internal.hash.DefaultStreamHasher.doHash(DefaultStreamHasher.java:54) > at org.gradle.internal.hash.DefaultStreamHasher.hash(DefaultStreamHasher.java:38) > ... 133 more属性而不是更改约束（我猜布局计算可能效率低下）。

只需对代码进行微小更改即可。首先使用以下方法计算transform：

然后通过替换：

移动

let c = self.cardView.transform.ty - translation.y

cardView

用这个：

self.cardView.frontCardConstraint.constant = c
self.cardView.layoutIfNeeded()

完成平移后，只需设置self.cardView.transform = CGAffineTransform.identity.translatedBy(x: c, y: 0)即可将其重置。

使用UIPanGestureRecognizer时，约束常量的变化是滞后的

1 个答案: