iOS开发之1行代码实现缓存计算及清除缓存

//// gzhCache.h// cache//// Created by 郭志贺 on 2020/5/27.// Copyright © 2020 郭志贺. All rights reserved.//#import <Foundation/Foundation.h>NS_ASSUME_NONNULL_BEGIN@interface gzhCache : NSObject/// 计算缓存大小+(float)filePath;/// 清理缓存+(void)clearCache;@endNS_ASSUME_NONNULL_END

//// gzhCache.m// cache//// Created by 郭志贺 on 2020/5/27.// Copyright © 2020 郭志贺. All rights reserved.//#import "gzhCache.h"@implementation gzhCache// 显示缓存大小+ (float)filePath {  NSString * cachPath = [ NSSearchPathForDirectoriesInDomains ( NSCachesDirectory , NSUserDomainMask , YES ) firstObject ];  return [ self folderSizeAtPath :cachPath];}//计算单个文件的大小+ (long long) fileSizeAtPath:( NSString *) filePath{  NSFileManager * manager = [ NSFileManager defaultManager ];  if ([manager fileExistsAtPath :filePath]){    return [[manager attributesOfItemAtPath :filePath error : nil ] fileSize ];  }  return 0 ;}//遍历文件夹获得文件夹大小，返回多少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)clearCache {  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");}@end

NSString *str = [NSString stringWithFormat:@"%.2fM",[gzhCache filePath]];

[gzhCache clearCache];