上个项目的一些反思 III

离线缓存

之前的项目因为实时性要求比较高,所以一打开客户端,就开始做网络请求.现在想想,是没有做内容的离线缓存.这个问题,我没意识到.产品经理也没有意识到...

我觉得Archiver,来做比较合适,可复写.可直接从存储中读取model,(当然要在相应的model里实现NSCoding协议)代码如下

#pragma mark ============实现NSCoding协议 

//归档

- (void)encodeWithCoder:(NSCoder *)Coder

{

    NSDate *  senddate=[NSDate date];

    NSDateFormatter  *dateformatter=[[NSDateFormatter alloc] init];

    [dateformatter setDateFormat:@"YYYY-MM-dd,hh:mm:ss"];

    NSString *str = [NSString stringWithFormat:@"Cached@:%@",[dateformatter stringFromDate:senddate]];

    [Coder encodeObject:_citynm forKey:@"CityName"];

    [Coder encodeObject:_weather forKey:@"Weather"];

    [Coder encodeObject:_temperature_curr forKey:@"NowTemp"];

    [Coder encodeObject:str forKey:@"days"];

    [Coder encodeObject:UIImagePNGRepresentation(_Logo) forKey:@"img"];

}

//解档

- (nullable instancetype)initWithCoder:(NSCoder *)Decoder // NS_DESIGNATED_INITIALIZER

{

    if (self = [super init]) {

        self.citynm = [Decoder decodeObjectForKey:@"CityName"];

        self.weather = [Decoder decodeObjectForKey:@"Weather"];

        self.temperature_curr = [Decoder decodeObjectForKey:@"NowTemp"];

        self.days   =   [Decoder decodeObjectForKey:@"days"];

        self.Logo = [UIImage imageWithData:[Decoder decodeObjectForKey:@"img"]];

    }

    return self;

}

Archiver的封装

#import <Foundation/Foundation.h>

@interface ArchiverCache : NSObject

/**

*  归档

*

*  @param model model

*  @param Key   Key

*/

-(void)EncoderDoWithModel:(id)model withKey:(NSString*)Key;

/**

 *  反归档

 *

 *  @param Key

 *

 *  @return (id)Model

 */

-(id)UncoderDoWith:(NSString*)Key;

@end

====================.M=================

#import "ArchiverCache.h"

@implementation ArchiverCache

//archiver

-(void)EncoderDoWithModel:(id)model withKey:(NSString *)Key

{

    NSMutableData *data = [[NSMutableData alloc] init];

    //创建归档辅助类

    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];

    //编码

    [archiver encodeObject:model forKey:Key];

    //结束编码

    [archiver finishEncoding];

    //写入

    if ([data writeToFile:[self GetFilePath] atomically:YES]) {

        NSLog(@"Cache Set Success");

    }else{

        NSLog(@"Cache Set Fail");

    }

}

//Unarchiver

-(id)UncoderDoWith:(NSString *)Key

{

    ///////////////////////解档

    NSData *_data = [[NSData alloc] initWithContentsOfFile:[self GetFilePath]];

    //解档辅助

    NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:_data];

    //解码并解档出model

    id Wm = [unarchiver decodeObjectForKey:Key];

    //关闭解档

    [unarchiver finishDecoding];

    return Wm;

}

-(NSString *)GetFilePath

{

    NSArray *arr = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);

    //虽然该方法返回的是一个数组，但是由于一个目标文件夹只有一个目录，所以数组中只有一个元素。

    NSString *cachePath = [arr lastObject];

    NSString *filePath = [cachePath stringByAppendingPathComponent:@"Model"];

//    NSLog(@"%@",filePath);

    return filePath;

}

@end

调用,在这个例子里,每次进行model操作的时候,都会直接进行归档操作.这样可以保持归档里的数据都是最新的.

-(id)NetViewModelWithCache

{

    //读取缓存...

    ArchiverCache *ar = [[ArchiverCache alloc] init];

    //需在相应的model实现 initWithCoder;

    WeatherModel *Wm = [ar UncoderDoWith:@"weather"];

    return Wm;

}

-(id)ConvertToModel:(id)Data

{

    WeatherModel *model = [[WeatherModel alloc] initWithDictionary:Data];

    ///转成模型,同时把IMG给下载了.....由于API里的ICON是GIF,为了省事,这里直接另找了一张图.(可用sdwebimage来处理gif)

    NSString *imageURLStr = @"http://pic.58pic.com/58pic/15/48/73/04f58PIC37y_1024.png";

    NSData *imageData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:imageURLStr]];

    model.Logo = [UIImage imageWithData:imageData];

    ArchiverCache *ar = [[ArchiverCache alloc] init];

    //需在相应的model实现 encodeWithCoder;

    [ar EncoderDoWithModel:model withKey:@"weather"];

    return model;

}

巴特西

上个项目的一些反思 III

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