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iOS中自動實現(xiàn)對象序列化的方法詳解

2020-07-26 02:49:45
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前言

在iOS 中實現(xiàn)對象序列化,需要遵行NSCoding協(xié)議,然后對對象的每個屬性進(jìn)行歸檔和接檔賦值,響應(yīng)的操作比較繁瑣。本文主要介紹 利用 runtime遍歷屬性 大大簡化代碼量,下面來看看詳細(xì)的介紹吧。

具體實現(xiàn)代碼如下:

1.先建立NSobject的分類, 定義可能用到的相關(guān)類型

static NSString *intType  = @"i"; // int_32t(枚舉int型)static NSString *longTpye = @"l"; //long類型static NSString *longlongType= @"q"; // longlong類型static NSString *BoolType = @"B"; //bool類型static NSString *floatType = @"f"; // floatstatic NSString *doubleType = @"d"; // doublestatic NSString *boolType = @"c";static NSString *stringType = @"NSString"; // NSString 類型static NSString *numberType = @"NSNumber"; // NSNumber 類型static NSString *arrayType = @"arrayType";//array類型static NSString *imageType = @"UIImage"; // UIImage 類型

然后在歸檔方法中便利自身的屬性名稱,并且取出自身屬性對應(yīng)的值,進(jìn)行存儲到本地。此時遍歷類屬性本身,用到了Ivar指針(定義對象的實例變量,包括類型和名字),具體代碼如下

//歸檔- (void)encodeWithCoder:(NSCoder *)aCoder{ unsigned int count; // 屬性個數(shù) Ivar *varArray = class_copyIvarList([self class], &count); for (int i = 0; i < count; i++) {  Ivar var = varArray[i];  const char *cName = ivar_getName(var); // 屬性名c字符串  NSString *proName = [[NSString stringWithUTF8String:cName] substringFromIndex:1]; //OC字符串,并且去掉下劃線 _  const char *cType = ivar_getTypeEncoding(var); // 獲取變量類型,c字符串  id value = [self valueForKey:proName];  NSString *proType = [NSString stringWithUTF8String:cType]; // oc 字符串  if ([proType containsString:@"NSString"]) {   proType = stringType;  }  if ([proType containsString:@"NSNumber"]) {   proType = numberType;  }  if ([proType containsString:@"NSArray"]) {   proType = arrayType;  }  if ([proType containsString:@"UIImage"]) {   proType = imageType;  }  // (5). 根據(jù)類型進(jìn)行編碼  if ([proType isEqualToString:intType] || [proType isEqualToString:boolType] || [proType isEqualToString:BoolType]) {   [aCoder encodeInt32:[value intValue] forKey:proName];  }  else if ([proType isEqualToString:longTpye]) {   [aCoder encodeInt64:[value longValue] forKey:proName];  }  else if ([proType isEqualToString:floatType]) {   [aCoder encodeFloat:[value floatValue] forKey:proName];  }  else if ([proType isEqualToString:longlongType] || [proType isEqualToString:doubleType]) {   [aCoder encodeDouble:[value doubleValue] forKey:proName];  }  else if ([proType isEqualToString:stringType]) { // string 類型   [aCoder encodeObject:value forKey:proName];  }  else if ([proType isEqualToString:numberType]) {   [aCoder encodeObject:value forKey:proName];  }  else if ([proType isEqualToString:arrayType]) {   [aCoder encodeObject:value forKey:proName];  }  else if ([proType isEqualToString:imageType]) { // image 類型   [aCoder encodeDataObject:UIImagePNGRepresentation(value)];  } } free(varArray);}

其次進(jìn)行解檔, 原理和歸檔差不多, 直接上代碼

- (instancetype)initWithCoder:(NSCoder *)aDecoder{ self = [self init]; if (self) {  unsigned int count;  Ivar *varArray = class_copyIvarList([self class], &count);  for (int i = 0; i < count; i++) {   Ivar var = varArray[i];   const char *cName = ivar_getName(var); // 屬性名c字符串   NSString *proName = [[NSString stringWithUTF8String:cName] substringFromIndex:1]; //OC字符串,并且去掉下劃線 _   const char *cType = ivar_getTypeEncoding(var); // 獲取變量類型,c字符串   NSString *proType = [NSString stringWithUTF8String:cType]; // oc 字符串   if ([proType containsString:@"NSString"]) {    proType = stringType;   }   if ([proType containsString:@"NSNumber"]) {    proType = numberType;   }   if ([proType containsString:@"NSArray"]) {    proType = arrayType;   }   if ([proType containsString:@"UIImage"]) {    proType = imageType;   }   if ([proType isEqualToString:intType] || [proType isEqualToString:boolType] || [proType isEqualToString:BoolType]) {    int32_t number = [aDecoder decodeInt32ForKey:proName];    [self setValue:@(number) forKey:proName];   }   else if ([proType isEqualToString:longTpye]) {    int64_t number = [aDecoder decodeInt64ForKey:proName];    [self setValue:@(number) forKey:proName];   }   else if ([proType isEqualToString:floatType]) {    float number = [aDecoder decodeFloatForKey:proName];    [self setValue:@(number) forKey:proName];   }   else if ([proType isEqualToString:longlongType] || [proType isEqualToString:doubleType]) {    double number = [aDecoder decodeFloatForKey:proName];    [self setValue:@(number) forKey:proName];   }   else if ([proType isEqualToString:stringType]) { // string 類型    NSString *string = [aDecoder decodeObjectForKey:proName];    [self setValue:string forKey:proName];   }   else if ([proType isEqualToString:numberType]) {    NSString *number = [aDecoder decodeObjectForKey:proName];    [self setValue:number forKey:proName];   }   else if ([proType isEqualToString:arrayType]) {    NSArray *array = [aDecoder decodeObjectForKey:proName];    [self setValue:array forKey:proName];   }   else if ([proType isEqualToString:imageType]) { // image 類型    UIImage *image = [UIImage imageWithData:[aDecoder decodeDataObject]];    [self setValue:image forKey:proName];   }  } } return self;}

最后也就是 存儲方法 、 清除存儲的本地緩存 和 獲取本地存儲數(shù)據(jù)的方法

//存儲路徑- (NSString *)filePathWithUniqueFlagString:(NSString *)uniqueFlag{ NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]; NSString *detailPath = [NSString stringWithFormat:@"%@_%@",uniqueFlag,[NSString stringWithUTF8String:object_getClassName(self)]]; NSString *path = [docPath stringByAppendingPathComponent:detailPath]; return path;}//保存對象數(shù)據(jù)到本地- (void)saveDataToLocalWithUniqueFlagKey:(NSString *)uniqueFlagKey{ [NSKeyedArchiver archiveRootObject:self toFile:[self filePathWithUniqueFlagString:uniqueFlagKey]];}//清空本地存儲的對象數(shù)據(jù)- (id)getDataFromLocalWithUniqueFlagKey:(NSString *)uniqueFlagKey{ return [NSKeyedUnarchiver unarchiveObjectWithFile:[self filePathWithUniqueFlagString:uniqueFlagKey]];}//從本地獲取對象數(shù)據(jù)- (BOOL)removeDataFromLocalWithUniqueFlagKey:(NSString *)uniqueFlagKey{ NSError *error = nil; [[NSFileManager defaultManager] removeItemAtPath:[self filePathWithUniqueFlagString:uniqueFlagKey] error:&error]; if (!error) {  return YES; } else {  return NO; }}

完整項目下載地址如下:https://github.com/maxzhang123/MXCoding.git  或者可以本地下載地址:http://xiazai.VeVB.COm/201705/yuanma/MXCoding(VeVB.COm).rar

總結(jié)

以上就是這篇文章的全部內(nèi)容了,希望本文的內(nèi)容對大家的學(xué)習(xí)或者工作能帶來一定的幫助,如果有疑問大家可以留言交流,謝謝大家對武林網(wǎng)的支持。

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