一直寻寻觅觅找app的清除缓存的方法,发现:并没有什么固定的方法,你既然有做对应的缓存机制,这个机制就应该有清除缓存的方法。例如如果你使用某个第三方的图片库,这个库有缓存机制,那么它就应该提供对应的清除缓存的方法。你调用对应的方法进行清除,如果你自己有用到数据库,那么你就应该清除数据库里面的数据等等。有的公司需求是显示缓存大小,有的不需要:
@property ( nonatomic , strong ) UILabel * cachLabel;//显示缓存有多少m
cell.cachLabel . text = [ NSString stringWithFormat : @"(%.2fM)" , [ self filePath ]];
// 显示缓存大小
- ( float )filePath
{
NSString * cachPath = [ NSSearchPathForDirectoriesInDomains ( NSCachesDirectory , NSUserDomainMask , YES ) firstObject ];
return [ self folderSizeAtPath :cachPath];
}
不需要显示缓存大小M的:
//iOS8以上的版本使用
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:@"是否清除缓存?"preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
//清除缓存所需要做的处理
[self clearFile];
}];
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
}];
[alertController addAction:okAction];
[alertController addAction:cancelAction];
[self presentViewController:alertController animated:YES completion:nil];
#pragma mark ---action---
//1:首先我们计算一下 单个文件的大小
- ( long long ) fileSizeAtPath:( NSString *) filePath{
NSFileManager * manager = [ NSFileManager defaultManager ];
if ([manager fileExistsAtPath :filePath]){
return [[manager attributesOfItemAtPath :filePath error : nil ] fileSize ];
}
return 0 ;
}
//2: 遍历文件夹获得文件夹大小,返回多少 M(提示:你可以在工程界设置()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 );
}
// 清理缓存
- ( void )clearFile
{
NSString * cachPath = [ NSSearchPathForDirectoriesInDomains ( NSCachesDirectory , NSUserDomainMask , YES ) firstObject ];
NSArray * files = [[ NSFileManager defaultManager ] subpathsAtPath :cachPath];
NSLog ( @"cachpath = %@" , cachPath);
for ( NSString * p in files) {
NSError * error = nil ;
NSString * path = [cachPath stringByAppendingPathComponent :p];
if ([[ NSFileManager defaultManager ] fileExistsAtPath :path]) {
[[ NSFileManager defaultManager ] removeItemAtPath :path error :&error];
}
}
[ self performSelectorOnMainThread : @selector (clearCachSuccess) withObject :nil waitUntilDone : YES ];
}
- ( void )clearCachSuccess
{
NSLog ( @" 清理成功 " );
//iOS8以上的版本使用
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:@"缓存清理完毕"preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
}];
[alertController addAction:okAction];
[self presentViewController:alertController animated:YES completion:nil];
[self.tableView reloadInputViews];//清理完之后重新导入数据
}
给app评论功能实现
//评价
[[UIApplication sharedApplication]openURL:[NSURL URLWithString:@"http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?id=1017244804&pageNumber=0&sortOrdering=2&type=Purple+Software&mt=8"]];