iOS开发 _计算缓存大小／清理

// 获取Caches目录路径
- (NSString *)getCachesPath{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask,YES);
NSString *cachesDir = [paths lastObject];
return cachesDir;
}

- (CGFloat)folderSizeAtPath:(NSString *)path{
NSFileManager *manager = [NSFileManager defaultManager];
CGFloat size = 0;
if ([manager fileExistsAtPath:path]) {
// 目录下的文件计算大小
NSArray *childrenFile = [manager subpathsAtPath:path];
for (NSString *fileName in childrenFile) {
NSString *absolutePath = [path stringByAppendingPathComponent:fileName];
size += [manager attributesOfItemAtPath:absolutePath error:nil].fileSize;
}
//SDWebImage的缓存计算
size += [[SDImageCache sharedImageCache] getSize]/1024.0/1024.0;
// 将大小转化为M
return size / 1024.0 / 1024.0;
}
return 0;
}

- (void)cleanCaches:(NSString *)path{
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:path]) {
NSArray *childrenFiles = [fileManager subpathsAtPath:path];
for (NSString *fileName in childrenFiles) {
// 拼接路径
NSString *absolutePath = [path stringByAppendingPathComponent:fileName];
// 将文件删除
[fileManager removeItemAtPath:absolutePath error:nil];
}
}
//SDWebImage的清除功能
[[SDImageCache sharedImageCache] clearDisk];
[[SDImageCache sharedImageCache] clearMemory];
}

- (void)cleanButtonAction:(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:@"缓存%.2fM", size] : [NSString stringWithFormat:@"缓存%.2fK", size * 1024.0];

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"删除缓存" message:message preferredStyle:UIAlertControllerStyleAlert];

UIAlertAction *action = [UIAlertAction actionWithTitle:@"确定" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction *action) {

[self cleanCaches:[self getCachesPath]];
}];

UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:(UIAlertActionStyleCancel) handler:nil];
[alertController addAction:action];
[alertController addAction:cancel];
[self presentViewController:alertController animated:YES completion:nil];
}