替代語法FO分配JSON數據objectForKey類的屬性

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我可以寫在一行中最後三行代碼：替代語法FO分配JSON數據objectForKey類的屬性

NSArray* latestLoans = [self.JsonData objectForKey:@"loans"]; 
for (id object in latestLoans) { 
NSDictionary* loan = object; 
newModelClass.name = [loan objectForKey:@"name"]; 
newModelClass.sector = [loan objectForKey:@"sector"]; 
newModelClass.activity = [loan objectForKey:@"activity"];

我的完整代碼是在這裏，如果有任何其他的最佳實踐，請建議我。

-(void)CopyOnlineData:(NSDictionary*)OnlineData{ 
self.JsonData = OnlineData; 
NSArray* latestLoans = [self.JsonData objectForKey:@"loans"]; 
for (id object in latestLoans) { 
NewModelClass *newModelClass = [[NewModelClass alloc] init]; 
NSDictionary* loan = object; 
newModelClass.name = [loan objectForKey:@"name"]; 
newModelClass.sector = [loan objectForKey:@"sector"]; 
newModelClass.activity = [loan objectForKey:@"activity"]; 
NSDictionary *loactionDictionary = loan[@"location"]; 
newModelClass.country = loactionDictionary[@"country_code"]; 
newModelClass.town = loactionDictionary[@"town"]; 
NSDictionary *imageid = loan[@"image"]; 
newModelClass.ImageId = imageid[@"id"]; 
NSLog(@"name: %@ \n town: %@\n sector: %@\n country: %@\n activity: %@\n image id: %@", newModelClass.name,newModelClass.town,newModelClass.sector,newModelClass.country,newModelClass.activity,newModelClass.ImageId); 
[self.tableData addObject:newModelClass]; 
} 
[[self KivaTableView]reloadData]; 
}

謝謝

來源

2016-05-24 Sujananth Visvaratnam

號爲什麼你想要？你的'Return'鍵是否打破？ – trojanfoe

不是，但是你可以通過創建一個採用JSON字典的初始化程序來處理'loan'反序列化：'NewModelClass * newModelClass = [[NewModelCalss alloc] initWithJSONDict：object]; [self.tableData addObject：newModelClass];'這樣，如果其他地方有一個從字典中創建的'NewModelClass'對象，就準備好了。 – Larme

@Larme，謝謝 –

繼承人我會做什麼：
爲了從這部分代碼中刪除它創建NewModelClass自定義的初始化。這樣，如果您必須創建NewModelClass的新對象，則不必重寫所有行。

在NewModelClass.h：

-(id)initWithJSONDict:(NSDictionary *)dict;

在NewModelClass.m：

-(id)initWithJSONDict:(NSDictionary *)dict 
{ 
    self = [super init]; 
    if (self) 
    { 
     self.name = [dict objectForKey:@"name"]; 
     self.sector = [dict objectForKey:@"sector"]; 
     self.activity = [dict objectForKey:@"activity"]; 
     NSDictionary *loactionDictionary = dict[@"location"]; 
     self.country = loactionDictionary[@"country_code"]; //or dict[@"location][@"country_code"]; 
     self.town = loactionDictionary[@"town"];//or dict[@"location][@"town"]; 
     NSDictionary *imageid = dict[@"image"]; 
     self.ImageId = imageid[@"id"];//or dict[@"image][@"id"]; 
    } 
    return self; 
}

我重寫description太：

-(NSString *)description 
{ 
    return [NSString stringWithFormat:@"<%@ %p>: name: %@ \n town: %@\n sector: %@\n country: %@\n activity: %@\n image id:", [self class], self, self.name, self.town, self.sector, self.country, self.activity, self.ImageId ]; 
}

然後在你的代碼：

-(void)addOnlineData:(NSDictionary*)onlineData 
{ 
    self.JsonData = onlineData; 
    NSArray* latestLoans = [self.JsonData objectForKey:@"loans"]; 
    for (NSDictionary *aLoan in latestLoans) 
    { 
     NewModelClass *newModelClass = [[NewModelClass alloc] initWithJSONDict:aLoan]; 
     NSLog(@"Loan: %@", loan); 
     [self.tableData addObject:newModelClass]; 
    } 
    [[self KivaTableView]reloadData]; 
}

的for循環修改，因爲你已經知道這是一個NSDictionary，所以沒有用的for id，然後id投地NSDictionary。

修改方法名稱：
以小寫字母開頭的方法。
如果您不做副本，請避免以「複製」開始。

注意：此代碼未經過測試，由於輕微的語法錯誤可能無法編譯，但您應該瞭解主要想法。

來源

2016-05-24 10:27:46 Larme

替代語法FO分配JSON數據objectForKey類的屬性

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