如何删除ios应用程序的tmp目录文件？

Question

我正在开发一个使用 iPhone 摄像头的应用程序，经过多次测试后，我意识到它将所有捕获的视频存储在应用程序的 tmp 目录中。 即使手机重新启动，捕获的内容也不会消失。

有什么方法可以删除所有这些捕获，或者有什么方法可以轻松清理所有缓存和临时文件？

Answer 1

是的。这个方法效果很好：

+ (void)clearTmpDirectory
{
    NSArray* tmpDirectory = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:NSTemporaryDirectory() error:NULL];
    for (NSString *file in tmpDirectory) {
        [[NSFileManager defaultManager] removeItemAtPath:[NSString stringWithFormat:@"%@%@", NSTemporaryDirectory(), file] error:NULL];
    }
}

Answer 2

Swift 3 版本作为扩展：

extension FileManager {
    func clearTmpDirectory() {
        do {
            let tmpDirectory = try contentsOfDirectory(atPath: NSTemporaryDirectory())
            try tmpDirectory.forEach {[unowned self] file in
                let path = String.init(format: "%@%@", NSTemporaryDirectory(), file)
                try self.removeItem(atPath: path)
            }
        } catch {
            print(error)
        }
    }
}

使用示例：

FileManager.default.clearTmpDirectory()

感谢 Max Maier，Swift 2 版本：

func clearTmpDirectory() {
    do {
        let tmpDirectory = try NSFileManager.defaultManager().contentsOfDirectoryAtPath(NSTemporaryDirectory())
        try tmpDirectory.forEach { file in
            let path = String.init(format: "%@%@", NSTemporaryDirectory(), file)
            try NSFileManager.defaultManager().removeItemAtPath(path)
        }
    } catch {
        print(error)
    }
}

Answer 3

Swift 4

可能的实现之一

extension FileManager {
    func clearTmpDirectory() {
        do {
            let tmpDirURL = FileManager.default.temporaryDirectory
            let tmpDirectory = try contentsOfDirectory(atPath: tmpDirURL.path)
            try tmpDirectory.forEach { file in
                let fileUrl = tmpDirURL.appendingPathComponent(file)
                try removeItem(atPath: fileUrl.path)
            }
        } catch {
           //catch the error somehow
        }
    }
}

Answer 4

感谢马克斯·迈尔和罗曼·巴尔兹扎克。更新到 Swift 3，使用 URL 而不是字符串。

雨燕3

func clearTmpDir(){

        var removed: Int = 0
        do {
            let tmpDirURL = URL(string: NSTemporaryDirectory())!
            let tmpFiles = try FileManager.default.contentsOfDirectory(at: tmpDirURL, includingPropertiesForKeys: nil, options: .skipsHiddenFiles)
            print("\(tmpFiles.count) temporary files found")
            for url in tmpFiles {
                removed += 1
                try FileManager.default.removeItem(at: url)
            }
            print("\(removed) temporary files removed")
        } catch {
            print(error)
            print("\(removed) temporary files removed")
        }
}

Answer 5

尝试使用此代码删除 NSTemporaryDirectory 文件

-(void)deleteTempData
{
    NSString *tmpDirectory = NSTemporaryDirectory();
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    NSArray *cacheFiles = [fileManager contentsOfDirectoryAtPath:tmpDirectory error:&error];
    for (NSString *file in cacheFiles)
    {
        error = nil;
        [fileManager removeItemAtPath:[tmpDirectory stringByAppendingPathComponent:file] error:&error];
    }
}

并检查数据删除或不在 didFinishLaunchingWithOptions 中写入代码

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    [self.window makeKeyAndVisible];

    NSString *tmpDirectory = NSTemporaryDirectory();
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    NSArray *cacheFiles = [fileManager contentsOfDirectoryAtPath:tmpDirectory error:&error];
    NSLog(@"TempFile Count ::%lu",(unsigned long)cacheFiles.count);

    return YES;
}

Answer 6

我知道我迟到了，但我想放弃直接在 URL 上运行的实现：

let fileManager = FileManager.default
let temporaryDirectory = fileManager.temporaryDirectory
try? fileManager
    .contentsOfDirectory(at: temporaryDirectory, includingPropertiesForKeys: nil, options: .skipsSubdirectoryDescendants)
    .forEach { file in
        try? fileManager.removeItem(atPath: file.path)
    }

Answer 7

这适用于越狱的 iPad，但我认为这也应该适用于未越狱的设备。

-(void) clearCache
{
    for(int i=0; i< 100;i++)
    {
        NSLog(@"warning CLEAR CACHE--------");
    }
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError * error;
    NSArray * cacheFiles = [fileManager contentsOfDirectoryAtPath:NSTemporaryDirectory() error:&error];

    for(NSString * file in cacheFiles)
    {
        error=nil;
        NSString * filePath = [NSTemporaryDirectory() stringByAppendingPathComponent:file ];
        NSLog(@"filePath to remove = %@",filePath);

        BOOL removed =[fileManager removeItemAtPath:filePath error:&error];
        if(removed ==NO)
        {
            NSLog(@"removed ==NO");
        }
        if(error)
        {
            NSLog(@"%@", [error description]);
        }
    }
}

Answer 8

//
//  FileManager+removeContentsOfTemporaryDirectory.swift
//
//  Created by _ _ on _._.202_.
//  Copyright © 202_ _ _. All rights reserved.
//

import Foundation

public extension FileManager {

    /// Perform this method on a background thread.
    /// Returns `true` if :
    ///     * all temporary folder files have been deleted.
    ///     * the temporary folder is empty.
    /// Returns `false` if :
    ///     * some temporary folder files have not been deleted.
    /// Error handling:
    ///     * Throws `contentsOfDirectory` directory access error.
    ///     * Ignores single file `removeItem` errors.
    ///
    @discardableResult
    func removeContentsOfTemporaryDirectory() throws -> Bool  {
        
        if Thread.isMainThread {
            let mainThreadWarningMessage = "\(#file) - \(#function) executed on main thread. Do not block the main thread."
            assertionFailure(mainThreadWarningMessage)
        }
        
        do {
            
            let tmpDirURL = FileManager.default.temporaryDirectory
            let tmpDirectoryContent = try contentsOfDirectory(atPath: tmpDirURL.path)
            
            guard tmpDirectoryContent.count != 0 else { return true }
            
            for tmpFilePath in tmpDirectoryContent {
                let trashFileURL = tmpDirURL.appendingPathComponent(tmpFilePath)
                try removeItem(atPath: trashFileURL.path)
            }
            
            let tmpDirectoryContentAfterDeletion = try contentsOfDirectory(atPath: tmpDirURL.path)
            
            return tmpDirectoryContentAfterDeletion.count == 0
            
        } catch let directoryAccessError {
            throw directoryAccessError
        }
        
    }
}

Answer 9

使用此专用代码删除所有 tmp 文件：

let directory = FileManager.default.temporaryDirectory
try contentsOfDirectory(at: directory, includingPropertiesForKeys: []).forEach(removeItem)

_{如果需要，可以在执行 forEach 之前过滤内容}