iOS 之清理快取
阿新 • • 發佈:2019-01-09
//清除快取按鈕的點選事件
- (void)putBufferBtnClicked:(UIButton *)btn{
//呼叫方法計算目錄大小
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:@"快取%.2fM, 刪除快取", size] : [NSString stringWithFormat:@"快取%.2fK, 刪除快取", size * 1024.0];
UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:message preferredStyle:(UIAlertControllerStyleAlert)];
UIAlertAction *action = [UIAlertAction actionWithTitle:@"確定" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction *action) {
//呼叫方法刪除快取
[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實現對檔案的管理
NSFileManager *manager = [NSFileManager defaultManager];
CGFloat size = 0;
if ([manager fileExistsAtPath:path]) {
// 獲取該目錄下的檔案,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;
}
// 根據路徑刪除檔案
- (void)cleanCaches:(NSString *)path{
// 利用NSFileManager實現對檔案的管理
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:path]) {
// 獲取該路徑下面的檔名
NSArray *childrenFiles = [fileManager subpathsAtPath:path];
for (NSString *fileName in childrenFiles) {
// 拼接路徑
NSString *absolutePath = [path stringByAppendingPathComponent:fileName];
// 將檔案刪除
[fileManager removeItemAtPath:absolutePath error:nil];
}
}
轉載自點選開啟連結