How to remove tmp directory files of an ios app?

Yes. This method works well:

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

Swift 3 version as extension:

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)        }    }}

Example of usage:

FileManager.default.clearTmpDirectory()

Thanks to Max Maier, Swift 2 version:

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)    }}

Swift 4

One of the possible implementations

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        }    }}