//獲取路徑
 NSString *path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
 // 計算文件夾所有問價所占的空間
 CGFloat size = [self caculateFileCapacityAtPath:path];
 // 移除所有的緩存
 [self removeFileAtPath:path];

計算文件夾大小

-(CGFloat)caculateFileCapacityAtPath:(NSString *)path{
    //獲取所有文件的大小
    CGFloat totalsize = 0.0 ;
    NSFileManager *filemanage = [NSFileManager defaultManager];
    if ([filemanage fileExistsAtPath:path]) {
        NSArray *subpaths = [filemanage subpathsAtPath:path];
        NSEnumerator *enuerr = [subpaths objectEnumerator];
        NSString *subfilepath ;
        while (subfilepath = [enuerr nextObject]) {
            NSString *filepath = [path stringByAppendingPathComponent:subfilepath];
            NSDictionary *dic = [filemanage attributesOfItemAtPath:filepath error:nil];
            if (dic) {
                CGFloat filesize = [[dic objectForKey:@"NSFileSize"] floatValue];
                totalsize += filesize ;
            }else{
                NSLog(@"屬性不存在");
            }
        }
        // 返回單位為 M
        return totalsize/(1024.0 * 1024.0) ;
    }else{
        return 0.0 ;
    }
}

清除文件夾下的內容

/* 清除該路徑下所有的文件以及文件夾 */
-(void)removeFileAtPath:(NSString *)path{
    NSFileManager *filemanage = [NSFileManager defaultManager];
    if ([filemanage fileExistsAtPath:path]) {
        // 找出該文件夾下所有文件所在的子路徑
        NSArray *subpaths = [filemanage subpathsAtPath:path];
        /* NSEnumerator 用于快速遍歷subpaths中的元素  */
        NSEnumerator *enumerr = [subpaths objectEnumerator];
        /* 遍歷至最后一個對象之后 返回值為空 */
        NSString *subpath ;
        while (subpath = [enumerr nextObject]) {
            NSString *filepath = [path stringByAppendingPathComponent:subpath];
            [filemanage removeItemAtPath:filepath error:nil];
        }
    }else{
        NSLog(@"該文件夾不存在");
    }
}