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iOS清理缓存的几种方法，有需要的朋友可以参考下：
1.计算文件大小：
- (long long) fileSizeAtPath:(NSString*) filePath{
NSFileManager* manager = [NSFileManager defaultManager];
if ([manager fileExistsAtPath:filePath]){
return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];
}
return 0;
}
2.计算文件夹大小:
//遍历文件夹获得文件夹大小，返回多少M
- (float ) folderSizeAtPath:(NSString*) folderPath{
NSFileManager* manager = [NSFileManager defaultManager];
if (![manager fileExistsAtPath:folderPath]) return 0;
NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];
NSString* fileName;
long long folderSize = 0;
while ((fileName = [childFilesEnumerator nextObject]) != nil){
NSString* fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];
folderSize += [self fileSizeAtPath:fileAbsolutePath];
}
return folderSize/(1024.0*1024.0);
}
3.清除缓存第一种
- (void)action:(id)sender
{
//彻底清除缓存第一种方法
UIButton * button = sender;
[button setTitle:@"清理完毕" forState:UIControlStateNormal];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSString *path = [paths lastObject];
NSString *str = [NSString stringWithFormat:@"缓存已清除%.1fM", [self folderSizeAtPath:path]];
NSLog(@"%@",str);
NSArray *files = [[NSFileManager defaultManager] subpathsAtPath:path];
for (NSString *p in files) {
NSError *error;
NSString *Path = [path stringByAppendingPathComponent:p];
if ([[NSFileManager defaultManager] fileExistsAtPath:Path]) {
[[NSFileManager defaultManager] removeItemAtPath:Path error:&error];
}
}
4.SDImage第三方清除缓存的方法: (清除的一般是图片的缓存)
[[SDImageCache sharedImageCache] clearDisk]; //清楚磁盘缓存
[[SDImageCache sharedImageCache] clearMemory]; //清楚内存缓存
5.开启多线程清除缓存：
dispatch_async(
dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
, ^{
NSString *cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSLog(@"%@", cachPath);
NSArray *files = [[NSFileManager defaultManager] subpathsAtPath:cachPath];
NSLog(@"files :%d",[files count]);
for (NSString *p in files) {
NSError *error;
NSString *path = [cachPath stringByAppendingPathComponent:p];
if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {
[[NSFileManager defaultManager] removeItemAtPath:path error:&error];
}
}
[self performSelectorOnMainThread:@selector(clearCacheSuccess) withObject:nil waitUntilDone:YES];});
}
-(void)clearCacheSuccess
{
NSLog(@"清理成功");
}
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原文地址：http://www.cnblogs.com/pengsi/p/5106686.html
