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IOS 之 计算缓存,清除缓存
基本上所有的应用都会有清除缓存的功能,如果没有这项功能的话,手机负担会很大, 本文主要讲一下怎么实现查看缓存,清除缓存
1. 为了方便展示, 创建一个button
- (void)viewDidLoad {
[superviewDidLoad];
// Do any additional setup after loading the view.
//设置页面背景图片
self.view.backgroundColor = [UIColorcolorWithPatternImage:[UIImageimageNamed:@"iPhone6-portrait@2x.png"]];
self.view.alpha =0.6;
self.button1 = [UIButtonbuttonWithType:UIButtonTypeCustom];
self.button1.backgroundColor = [UIColorclearColor];
self.button1.frame =CGRectMake(25,200, 200, 40);
[self.button1setBackgroundImage:[UIImageimageNamed:@"5.png"]forState:UIControlStateNormal];
[self.button1addTarget:selfaction:@selector(clearCacheFlies)forControlEvents:UIControlEventTouchUpInside];
[self.button1setTitleColor:[UIColordarkGrayColor] forState:UIControlStateNormal];
[self.viewaddSubview:self.button1];
}
2. 在视图将要出现的时候, 计算有多少缓存
- (void)viewWillAppear:(BOOL)animated
{
//清除缓存计算缓存大小
// 获取要清除缓存的路径
NSString *cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES) objectAtIndex:0];
// 调用folderSizeAtPath方法计算缓存路径下的文件size
CGFloat fileSize = [selffolderSizeAtPath:cachPath];
NSLog(@"~~%f",fileSize);
NSString *str = [NSStringstringWithFormat:@"清除缓存%.1fM", fileSize];
[self.button1setTitle:str forState:UIControlStateNormal];
self.button1.showsTouchWhenHighlighted =YES;
NSLog(@"%@",NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES));
}
//二、计算缓存cache文件夹下文件大小。
//单个文件的大小
- (longlong)fileSizeAtPath:(NSString*) filePath{
NSFileManager* manager = [NSFileManagerdefaultManager];
if([manager fileExistsAtPath:filePath]){
return[[managerattributesOfItemAtPath:filePath error:nil]fileSize];
}
return 0;
}
//遍历文件夹获得文件夹大小，返回多少M
- (float) folderSizeAtPath:(NSString*) folderPath{
NSFileManager* manager = [NSFileManagerdefaultManager];
if(![manager fileExistsAtPath:folderPath])
return 0;
NSEnumerator *childFilesEnumerator = [[managersubpathsAtPath:folderPath] objectEnumerator];
NSString* fileName;
long long folderSize =0;
while((fileName = [childFilesEnumerator nextObject]) != nil){
NSString* fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];
folderSize += [selffileSizeAtPath:fileAbsolutePath];
}
return folderSize/(1024.0*1024.0);//得到缓存大小M
}
//一、清理缓存cache文件夹，删除文件方法
-(void)clearCacheFlies
{
UIAlertView *alert = [[UIAlertViewalloc] initWithTitle:@"提示"message:@"清除缓存成功"delegate:selfcancelButtonTitle:nilotherButtonTitles:@"确定",nil];
[alertshow];
[self.button1setTitle:@"清除缓存0M"forState:UIControlStateNormal];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0), ^{
NSString *cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES) objectAtIndex:0];
NSArray *files = [[NSFileManagerdefaultManager] subpathsAtPath:cachPath];
NSLog(@"files :%ld",[filescount]);
for (NSString *pin files) {
NSError *error;
NSString *path = [cachPath stringByAppendingPathComponent:p];
if ([[NSFileManagerdefaultManager] fileExistsAtPath:path]) {
// 删除缓存
[[NSFileManagerdefaultManager] removeItemAtPath:patherror:&error];
}
NSLog(@"清理成功！");
}
});
}
清除缓存之前
2.清除之后
本文标签： IOS 之 计算缓存 清除缓存
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