缓存文件存储在沙盒文件夹Caches中，实现清除缓存，主要就是实现找到文件 - - 删除文件（其中涉及到计算文件大小）
下载地址：http://pan.baidu.com/s/1mgGcpBy
以下是实现清除缓存的主要代码
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface CleanCache : NSObject
- (NSString *)getCache;
- (NSString *)getDoc;
- (CGFloat)folderSizeAtPath;
- (void)clearCache;
+ (id)defaultCleanCache；
@end
#import "CleanCache.h"
@implementation CleanCache
+ (id)defaultCleanCache{
static CleanCache *clean = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
clean = [[CleanCache alloc] init];
});
return clean;
}
//获取缓存路径
- (NSString *)getCache{
NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject];
return cachePath;
}
//获取持久化数据的路径
- (NSString *)getDoc{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docPath = paths.lastObject;
return docPath;
}
//获取文件夹大小
- (CGFloat)folderSizeAtPath{
//创建文件管理器
NSFileManager *manager = [NSFileManager defaultManager];
//获取文件夹路径
NSString *folderPath = [self getCache];
NSString *docPath = [self getDoc];
//如果缓存文件不存在，就返回0
if (![manager fileExistsAtPath:folderPath] && ![manager fileExistsAtPath:docPath]) {
return 0;
}
NSString *fileName = nil;//定义一个空的文件名，用来获取枚举器中的文件名
long long folderSize = 0;//定义并初始化文件大小为0
if ([manager fileExistsAtPath:folderPath]) {
//如果缓存文件存在就计算缓存文件的大小
NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];//从缓存路径中的文件数组得到枚举器
while ((fileName = [childFilesEnumerator nextObject]) != nil) {
//得到单个文件的绝对路径
NSString *fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];
//定义单个文件变量并初始化为0
float singleFileSize = 0.0;
//如果该单个文件存在，获取单个文件的大小
if ([manager fileExistsAtPath:fileAbsolutePath]) {
//attributesOfItemAtPath:获取文件的属性
singleFileSize = [[manager attributesOfItemAtPath:fileAbsolutePath error:nil] fileSize];
}
folderSize += singleFileSize;
}
}
if ([manager fileExistsAtPath:docPath]) {
//如果缓存文件存在就计算缓存文件的大小
NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:docPath] objectEnumerator];//从缓存路径中的文件数组得到枚举器
while ((fileName = [childFilesEnumerator nextObject]) != nil) {
//得到单个文件的绝对路径
NSString *fileAbsolutePath = [docPath stringByAppendingPathComponent:fileName];
//定义单个文件变量并初始化为0
float singleFileSize = 0.0;
//如果该单个文件存在，获取单个文件的大小
if ([manager fileExistsAtPath:fileAbsolutePath]) {
//attributesOfItemAtPath:获取文件的属性
singleFileSize = [[manager attributesOfItemAtPath:fileAbsolutePath error:nil] fileSize];
}
folderSize += singleFileSize;
}
}
return folderSize;
}
//清除缓存
- (void)clearCache{
NSFileManager *manager = [NSFileManager defaultManager];
NSString *floderPath = [self getCache];
NSString *docPath = [self getDoc];
if ([manager fileExistsAtPath:floderPath]) {
NSArray *childFiles = [manager subpathsAtPath:floderPath];
for (NSString *fileName in childFiles) {
NSString *absolutePath = [floderPath stringByAppendingPathComponent:fileName];
[manager removeItemAtPath:absolutePath error:nil];
}
}
if ([manager fileExistsAtPath:docPath]) {
NSArray *childFiles = [manager subpathsAtPath:docPath];
for (NSString *fileName in childFiles) {
NSString *absolutePath = [docPath stringByAppendingPathComponent:fileName];
[manager removeItemAtPath:absolutePath error:nil];
}
}
//使用第三方类图片异步下载SDWebImage的话，就使用这个第三方类的自带的清除缓存的方法
// [[SDImageCache sharedImageCache] cleanDisk];
}
@end