iOS之清除缓存

  1 //清除缓存按钮的点击事件
  2 
  3 - (void)putBufferBtnClicked:(UIButton *)btn{
  4 
  5      CGFloat size = [self folderSizeAtPath:NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).lastObject] + [self folderSizeAtPath:NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES).lastObject] + [self folderSizeAtPath:NSTemporaryDirectory()];
  6 
  7     
  8 
  9     NSString *message = size > 1 ? [NSString stringWithFormat:@"缓存%.2fM, 删除缓存", size] : [NSString stringWithFormat:@"缓存%.2fK, 删除缓存", size * 1024.0];
 10 
 11     
 12 
 13     UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:message preferredStyle:(UIAlertControllerStyleAlert)];
 14 
 15     
 16 
 17     UIAlertAction *action = [UIAlertAction actionWithTitle:@"确定" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction *action) {                [self cleanCaches];            }];
 18 
 19     
 20 
 21     UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:(UIAlertActionStyleCancel) handler:nil];
 22 
 23     [alert addAction:action];
 24 
 25     [alert addAction:cancel];
 26 
 27     [self showDetailViewController:alert sender:nil];
 28 
 29 }
 30 
 31  
 32 
 33 // 计算目录大小
 34 
 35 - (CGFloat)folderSizeAtPath:(NSString *)path{
 36 
 37     // 利用NSFileManager实现对文件的管理
 38 
 39     NSFileManager *manager = [NSFileManager defaultManager];
 40 
 41     CGFloat size = 0;
 42 
 43     if ([manager fileExistsAtPath:path]) {
 44 
 45         // 获取该目录下的文件，计算其大小
 46 
 47         NSArray *childrenFile = [manager subpathsAtPath:path];
 48 
 49         for (NSString *fileName in childrenFile) {
 50 
 51             NSString *absolutePath = [path stringByAppendingPathComponent:fileName];
 52 
 53             size += [manager attributesOfItemAtPath:absolutePath error:nil].fileSize;
 54 
 55         }
 56 
 57         // 将大小转化为M
 58 
 59         return size / 1024.0 / 1024.0;
 60 
 61     }
 62 
 63     return 0;
 64 
 65 }
 66 
 67 // 根据路径删除文件
 68 
 69 - (void)cleanCaches:(NSString *)path{
 70 
 71     // 利用NSFileManager实现对文件的管理
 72 
 73     NSFileManager *fileManager = [NSFileManager defaultManager];
 74 
 75     if ([fileManager fileExistsAtPath:path]) {
 76 
 77         // 获取该路径下面的文件名
 78 
 79         NSArray *childrenFiles = [fileManager subpathsAtPath:path];
 80 
 81         for (NSString *fileName in childrenFiles) {
 82 
 83             // 拼接路径
 84 
 85             NSString *absolutePath = [path stringByAppendingPathComponent:fileName];
 86 
 87             // 将文件删除
 88 
 89             [fileManager removeItemAtPath:absolutePath error:nil];
 90 
 91         }
 92 
 93     }
 94 
 95 }
 96 
 97 //计算沙盒中文件的大小并删除沙盒中文件的例子：
 98 
 99 - (void)cleanCaches{
100 
101     [self cleanCaches:NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).firstObject];
102 
103     [self cleanCaches:NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES).firstObject];
104 
105     [self cleanCaches:NSTemporaryDirectory()];
106 
107 }
108 
109