第一步肯定要是为本地缓存的文件夹取一个名字的，比如说叫xiaohua

创建一个类，比如类名叫：LYCachePlistManager

//获取文件路径
+(NSString *)path:(NSString *)pathName{
    NSArray *array = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *pathIndes = [array objectAtIndex:0];
    NSString *path = [pathIndes stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist",pathName]];
    return path;
}

创建一个叫做xiaohua的plist文件

[LYCachePlistManager pathName:xiaohua];

写入文件

NSMutableDictionary *plistDict = [[NSMutableDictionary alloc]init];
 //添加新数据
[plistDict setObject:@“obj” forKey:@“key”];
//写入plist里面
 [plistDict writeToFile:[LYCachePlistManager path:xiaohua] atomically:YES];

删除文件

NSFileManager *fileMger = [NSFileManager defaultManager];
//要先判断文件路径是否存在
BOOL isBool = [fileMger fileExistsAtPath:[LYCachePlistManager path:xiaohua]];
if (isBool) {              
    [fileMger removeItemAtPath:xiaoXiPath error:nil];    
 }

获取plist文件

//获取plist文件字典
NSDictionaty *dict = [LYCachePlistManager pathName:xiaohua];
NSLog(@“dict = %@”, dict);

+(NSMutableDictionary *)pathName:(NSString *)pathName{
    NSMutableDictionary *dataDictionary = [[NSMutableDictionary alloc] initWithContentsOfFile:[LYCachePlistManager path:pathName]];
    return dataDictionary;
}