IOS 实现持久化数据存储_ios floatvalue-优快云博客

本文链接：https://blog.youkuaiyun.com/github_36262442/article/details/128566541

DataSaveUtil类提供了多种保存和读取数据的方法，如int、int32、int64、float、double、bool及对象数据，通过NSKeyedArchiver进行归档和解档操作，实现iOS应用的数据持久化存储到文档目录下。

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在实际开发中，出现类似于像Android持久化数据存储SharedPreferences以保存数据，具体实现思路是利用NSKeyedArchiver进行归档对象存储。

DataSaveUtil.h

#import <UIKit/UIKit.h>

@interface DataSaveUtil : NSObject

+(instancetype)datasave;

// 保存int数据
-(void)saveDateWithKeyAndIntValue:(NSString *)key intValue:(int)value;

// 保存int32数据
-(void)saveDateWithKeyAndInt32Value:(NSString *)key intValue:(int32_t)value;

// 保存int64数据
-(void)saveDateWithKeyAndInt64Value:(NSString *)key intValue:(int64_t)value;

// 保存float数据
-(void)saveDateWithKeyAndFloatValue:(NSString *)key floatValue:(float)value;

// 保存double数据
-(void)saveDateWithKeyAndDoubleValue:(NSString *)key doubleValue:(double)value;

// 保存bool数据
-(void)saveDateWithKeyAndBoolValue:(NSString *)key boolValue:(BOOL)value;

// 保存object数据
-(void)saveDateWithKeyAndValue:(NSString *)key value:(id)value;

// 读取int数据
-(int)readIntDataByKey:(NSString *)key defaultValue:(int)defaultValue;

// 读取int32数据
-(int32_t)readInt32DataByKey:(NSString *)key defaultValue:(int32_t)defaultValue;

// 读取int64数据
-(int64_t)readInt64DataByKey:(NSString *)key defaultValue:(int64_t)defaultValue;

// 读取float数据
-(float)readFloatDataByKey:(NSString *)key defaultValue:(float)defaultValue;

// 读取double数据
-(double)readDoubleDataByKey:(NSString *)key defaultValue:(double)defaultValue;

// 读取bool数据
-(BOOL)readBoolDataByKey:(NSString *)key defaultValue:(BOOL)defaultValue;

// 读取object数据
-(id)readObecjtDataByKey:(NSString *)key defaultValue:(id)defaultValue;

// 移除数据
-(BOOL)removeDataByKey:(NSString *)key;

@end

DataSaveUtil.m

#import <Foundation/Foundation.h>
#import "DataSaveUtil.h"

@interface DataSaveUtil()

@property(nonatomic, strong) NSString *documentPath;
@property(nonatomic, strong) NSString *filePath;

@end

@implementation DataSaveUtil

- (instancetype)init
{
    self = [super init];
    if (self) {
        // 获取归档路径
        self.documentPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).lastObject;
        self.filePath = [self.documentPath stringByAppendingPathComponent:@"save_data"];
        
    }
    return self;
}

+ (instancetype)datasave{
    static DataSaveUtil *instance;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        instance = [[DataSaveUtil alloc] init];
    });
    return instance;
}

- (void)saveDateWithKeyAndIntValue:(NSString *)key intValue:(int)value{
    // 用来承载数据的NSMutableData
    NSMutableData *data = [[NSMutableData alloc] init];
    // 归档对象
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
    // 运用encodeXXX方法归档数据
    [archiver encodeInt:value forKey:key];
    // 结束归档
    [archiver finishEncoding];
    // 写入数据（存储归档）
    [data writeToFile:[NSString stringWithFormat:@"%@_%@",self.filePath,key] atomically:YES];
}

- (void)saveDateWithKeyAndInt32Value:(NSString *)key intValue:(int32_t)value{
    // 用来承载数据的NSMutableData
    NSMutableData *data = [[NSMutableData alloc] init];
    // 归档对象
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
    // 运用encodeXXX方法归档数据
    [archiver encodeInt32:value forKey:key];
    // 结束归档
    [archiver finishEncoding];
    // 写入数据（存储归档）
    [data writeToFile:[NSString stringWithFormat:@"%@_%@",self.filePath,key] atomically:YES];
}

- (void)saveDateWithKeyAndInt64Value:(NSString *)key intValue:(int64_t)value{
    // 用来承载数据的NSMutableData
    NSMutableData *data = [[NSMutableData alloc] init];
    // 归档对象
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
    // 运用encodeXXX方法归档数据
    [archiver encodeInt64:value forKey:key];
    // 结束归档
    [archiver finishEncoding];
    // 写入数据（存储归档）
    [data writeToFile:[NSString stringWithFormat:@"%@_%@",self.filePath,key] atomically:YES];
}

- (void)saveDateWithKeyAndFloatValue:(NSString *)key floatValue:(float)value{
    // 用来承载数据的NSMutableData
    NSMutableData *data = [[NSMutableData alloc] init];
    // 归档对象
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
    // 运用encodeXXX方法归档数据
    [archiver encodeFloat:value forKey:key];
    // 结束归档
    [archiver finishEncoding];
    // 写入数据（存储归档）
    [data writeToFile:[NSString stringWithFormat:@"%@_%@",self.filePath,key] atomically:YES];
}

- (void)saveDateWithKeyAndDoubleValue:(NSString *)key doubleValue:(double)value{
    // 用来承载数据的NSMutableData
    NSMutableData *data = [[NSMutableData alloc] init];
    // 归档对象
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
    // 运用encodeXXX方法归档数据
    [archiver encodeDouble:value forKey:key];
    // 结束归档
    [archiver finishEncoding];
    // 写入数据（存储归档）
    [data writeToFile:[NSString stringWithFormat:@"%@_%@",self.filePath,key] atomically:YES];
}

- (void)saveDateWithKeyAndBoolValue:(NSString *)key boolValue:(BOOL)value{
    // 用来承载数据的NSMutableData
    NSMutableData *data = [[NSMutableData alloc] init];
    // 归档对象
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
    // 运用encodeXXX方法归档数据
    [archiver encodeBool:value forKey:key];
    // 结束归档
    [archiver finishEncoding];
    // 写入数据（存储归档）
    [data writeToFile:[NSString stringWithFormat:@"%@_%@",self.filePath,key] atomically:YES];
}

- (void)saveDateWithKeyAndValue:(NSString *)key value:(id)value{
    // 用来承载数据的NSMutableData
    NSMutableData *data = [[NSMutableData alloc] init];
    // 归档对象
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
    // 运用encodeXXX方法归档数据
    [archiver encodeObject:value forKey:key];
    // 结束归档
    [archiver finishEncoding];
    // 写入数据（存储归档）
    [data writeToFile:[NSString stringWithFormat:@"%@_%@",self.filePath,key] atomically:YES];
}

- (int)readIntDataByKey:(NSString *)key defaultValue:(int)defaultValue{
    int value = defaultValue;
    // NSMutableData用来承载解档出来的数据
    NSMutableData *resultData = [[NSMutableData alloc] initWithContentsOfFile:[NSString stringWithFormat:@"%@_%@",self.filePath,key]];
    // 解档对象
    NSKeyedUnarchiver *unArchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:resultData];
    if ([unArchiver containsValueForKey:key]) {
        value = [unArchiver decodeIntForKey:key];
    }
    // 结束解档
    [unArchiver finishDecoding];
    return value;
}

- (int32_t)readInt32DataByKey:(NSString *)key defaultValue:(int32_t)defaultValue{
    int32_t value = defaultValue;
    // NSMutableData用来承载解档出来的数据
    NSMutableData *resultData = [[NSMutableData alloc] initWithContentsOfFile:[NSString stringWithFormat:@"%@_%@",self.filePath,key]];
    // 解档对象
    NSKeyedUnarchiver *unArchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:resultData];
    if ([unArchiver containsValueForKey:key]) {
        value = [unArchiver decodeInt32ForKey:key];
    }
    // 结束解档
    [unArchiver finishDecoding];
    return value;
}

- (int64_t)readInt64DataByKey:(NSString *)key defaultValue:(int64_t)defaultValue{
    int64_t value = defaultValue;
    // NSMutableData用来承载解档出来的数据
    NSMutableData *resultData = [[NSMutableData alloc] initWithContentsOfFile:[NSString stringWithFormat:@"%@_%@",self.filePath,key]];
    // 解档对象
    NSKeyedUnarchiver *unArchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:resultData];
    if ([unArchiver containsValueForKey:key]) {
        value = [unArchiver decodeInt64ForKey:key];
    }
    // 结束解档
    [unArchiver finishDecoding];
    return value;
}

- (float)readFloatDataByKey:(NSString *)key defaultValue:(float)defaultValue{
    float value = defaultValue;
    // NSMutableData用来承载解档出来的数据
    NSMutableData *resultData = [[NSMutableData alloc] initWithContentsOfFile:[NSString stringWithFormat:@"%@_%@",self.filePath,key]];
    // 解档对象
    NSKeyedUnarchiver *unArchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:resultData];
    if ([unArchiver containsValueForKey:key]) {
        value = [unArchiver decodeFloatForKey:key];
    }
    // 结束解档
    [unArchiver finishDecoding];
    return value;
}

- (double)readDoubleDataByKey:(NSString *)key defaultValue:(double)defaultValue{
    double value = defaultValue;
    // NSMutableData用来承载解档出来的数据
    NSMutableData *resultData = [[NSMutableData alloc] initWithContentsOfFile:[NSString stringWithFormat:@"%@_%@",self.filePath,key]];
    // 解档对象
    NSKeyedUnarchiver *unArchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:resultData];
    if ([unArchiver containsValueForKey:key]) {
        value = [unArchiver decodeDoubleForKey:key];
    }
    // 结束解档
    [unArchiver finishDecoding];
    return value;
}

- (BOOL)readBoolDataByKey:(NSString *)key defaultValue:(BOOL)defaultValue{
    BOOL value = defaultValue;
    // NSMutableData用来承载解档出来的数据
    NSMutableData *resultData = [[NSMutableData alloc] initWithContentsOfFile:[NSString stringWithFormat:@"%@_%@",self.filePath,key]];
    // 解档对象
    NSKeyedUnarchiver *unArchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:resultData];
    if ([unArchiver containsValueForKey:key]) {
        value = [unArchiver decodeBoolForKey:key];
    }
    // 结束解档
    [unArchiver finishDecoding];
    return value;
}

- (id)readObecjtDataByKey:(NSString *)key defaultValue:(id)defaultValue{
    id value = defaultValue;
    // NSMutableData用来承载解档出来的数据
    NSMutableData *resultData = [[NSMutableData alloc] initWithContentsOfFile:[NSString stringWithFormat:@"%@_%@",self.filePath,key]];
    // 解档对象
    NSKeyedUnarchiver *unArchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:resultData];
    if ([unArchiver containsValueForKey:key]) {
        value = [unArchiver decodeObjectForKey:key];
    }
    // 结束解档
    [unArchiver finishDecoding];
    return value;
}

- (BOOL)removeDataByKey:(NSString *)key{
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSString *fpath = [NSString stringWithFormat:@"%@_%@",self.filePath,key];
    if ([fileManager fileExistsAtPath:fpath]) {
        // 移除数据
        return [fileManager removeItemAtPath:fpath error:nil];
    }
    return NO;
}

@end