首先應該獲取緩存路徑，然後計算緩存的總大小，最後在利用for循環，逐個刪除緩存文件夾裏面的文件

下面附上完整的代碼例子

//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:@"確定" 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;

}

// 將大小轉化為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];

}

}

ios 清除一個app的緩存