iOS之清除緩存，ios緩存

 

 

//清除緩存按鈕的點擊事件

- (void)putBufferBtnClicked:(UIButton *)btn{

     CGFloat size = [self folderSizeAtPath:NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).lastObject] + [self folderSizeAtPath:NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES).lastObject] + [self folderSizeAtPath:NSTemporaryDirectory()];

    

    NSString *message = size > 1 ? [NSString stringWithFormat:@"緩存%.2fM, 刪除緩存", size] : [NSString stringWithFormat:@"緩存%.2fK, 刪除緩存", size * 1024.0];

    

    UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:message preferredStyle:(UIAlertControllerStyleAlert)];

    

    UIAlertAction *action = [UIAlertAction actionWithTitle:@"肯定" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction *action) {                [self cleanCaches];            }];

    

    UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:(UIAlertActionStyleCancel) handler:nil];

    [alert addAction:action];

    [alert addAction:cancel];

    [self showDetailViewController:alert sender:nil];

}

 

// 計算目錄大小

- (CGFloat)folderSizeAtPath:(NSString *)path{

    // 利用NSFileManager實現對文件的管理

    NSFileManager *manager = [NSFileManager defaultManager];

    CGFloat size = 0;

    if ([manager fileExistsAtPath:path]) {

        // 獲取該目錄下的文件，計算其大小

        NSArray *childrenFile = [manager subpathsAtPath:path];

        for (NSString *fileName in childrenFile) {

            NSString *absolutePath = [path stringByAppendingPathComponent:fileName];

            size += [manager attributesOfItemAtPath:absolutePath error:nil].fileSize;

        }

        // 將大小轉化爲M

        return size / 1024.0 / 1024.0;

    }

    return 0;

}

// 根據路徑刪除文件

- (void)cleanCaches:(NSString *)path{

    // 利用NSFileManager實現對文件的管理

    NSFileManager *fileManager = [NSFileManager defaultManager];

    if ([fileManager fileExistsAtPath:path]) {

        // 獲取該路徑下面的文件名

        NSArray *childrenFiles = [fileManager subpathsAtPath:path];

        for (NSString *fileName in childrenFiles) {

            // 拼接路徑

            NSString *absolutePath = [path stringByAppendingPathComponent:fileName];

            // 將文件刪除

            [fileManager removeItemAtPath:absolutePath error:nil];

        }

    }

}

//計算沙盒中文件的大小並刪除沙盒中文件的例子：

- (void)cleanCaches{

    [self cleanCaches:NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).firstObject];

    [self cleanCaches:NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES).firstObject];

    [self cleanCaches:NSTemporaryDirectory()];

}