[英]Map NSArray with timestamps to NSDate objects with Mantle in iOS
例如,我有一個帶有屬性的MTLModel子類Order
@property (nonatomic, copy) NSArray *dates;
@property (nonatomic, strong) NSDate *dateFrom;
@property (nonatomic, strong) NSDate *dateTo;
來自服務器的JSON看起來像:
order = {
dates = (
1422784800,
1422784843
);
}
+ (NSValueTransformer *)datesJSONTransformer
mb是否可能以某種方式將JSON中的這兩個時間戳轉換為NSDate對象? (dateTo,dateFrom類的pr-s)
Mantle 1.x並不提供將JSON中的字段映射到多個模型屬性的簡便方法。 給定以下模型實現,這應該可以工作:
NSDictionary *JSONDictionary = @{
@"dates" : @[ @1422784800, @1422784843 ]
};
NSError *error = nil;
Order *order = [MTLJSONAdapter modelOfClass:Order.class fromJSONDictionary:JSONDictionary error:&error];
NSLog(@"Order is from %@ to %@", order.dateFrom, order.dateTo);
訂單執行:
@implementation Order
- (NSDate *)dateFrom
{
if ([self.dates count] > 0) {
return self.dates[0];
}
return nil;
}
- (NSDate *)dateTo
{
if ([self.dates count] > 1) {
return self.dates[1];
}
return nil;
}
#pragma mark - MTLJSONSerializing
+ (NSDictionary *)JSONKeyPathsByPropertyKey
{
return @{
@"dates" : @"dates"
};
}
+ (NSValueTransformer *)datesJSONTransformer
{
return [MTLValueTransformer transformerWithBlock:^NSArray *(NSArray *dates) {
if (![dates isKindOfClass:NSArray.class]) {
return nil;
}
NSMutableArray *dateObjects = [NSMutableArray arrayWithCapacity:dates.count];
for (NSNumber *timestamp in dates) {
NSDate *date = [NSDate dateWithTimeIntervalSince1970:[timestamp doubleValue]];
[dateObjects addObject:date];
}
return [dateObjects copy];
}];
}
@end
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