这篇文章主要为大家展示了iOS开发之如何实现缓存计算及清除缓存，内容简而易懂，希望大家可以学习一下，学习完之后肯定会有收获的，下面让小编带大家一起来看看吧。

话不多说，直接撸代码

//// gzhCache.h// cache//// Created by 郭志贺 on 2020/5/27.// Copyright &copy; 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 &copy; 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

需要查询大小的地方使用：

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

清理的方法调用

[gzhCache clearCache];

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