我从Dictionary获取数据。它运行良好并将数据存储在NSMutableArray中我希望在添加对象之前需要确保Array不包含具有相同名称和类型的相同对象。请参阅下文。
在插入对象之前,如果不需要插入,我们应该检查它是否包含带有Type和Name的对象。
NSArray *resultDic = [result1 objectForKey:@"results"];
for (int i = 0; i<[resultDic count]; i++) {
id item = [resultDic objectAtIndex:i];
NSDictionary *jsonDict = (NSDictionary *) item;
GetData *theObject =[[GetData alloc] init];
NSString*error = [jsonDict valueForKey:@"error"];
if(![error isEqualToString:@"No Record Found."])
{
[theObject setVaccineID:[jsonDict valueForKey:@"ID"]];
[theObject setVaccineName:[jsonDict valueForKey:@"Name"]];
[theObject setVaccinationType:[jsonDict valueForKey:@"Type"]];
[theObject setVaccineType:[jsonDict valueForKey:@"VType"]];
[theObject setFarmName:[jsonDict valueForKey:@"FName"]];
[theObject setDay:[jsonDict valueForKey:@"Day"]];
[theObject setAddedDateTime:[jsonDict valueForKey:@"DateTime"]];
[appDelegate.dataArray addObject:theObject];
}
}
答案 0 :(得分:1)
通用解决方案是教你的GetData
对象如何将自己与其他对象进行比较。如果可以比较它们,那么很容易确定匹配是否在任何集合中(并且您可能也想在其他上下文中比较它们)。通过实施isEqual:
来实现这一目标。这可能看起来像这样:
// in GetData.m
- (BOOL)isEqual:(id)object {
if ([object isKindOfClass:[GetData self]]) {
// assuming that the object is fully characterized by it's ID
return [self.vaccineId isEqual:((GetData *)object).vaccineId];
}
else {
return NO;
}
}
// have the hash value operate on the same characteristics as isEqual
- (NSUInteger)hash {
return [self.vaccineId hash];
}
完成后,您可以利用NSArray的containsObject:
。
// ...
if(![appDelegate.dataArray containsObject:theObject] && ![error isEqualToString:@"No Record Found."])
// ...