[NSDictionary dictionaryWithObjectsAndKeys: value,@"value", latestDate,@"latestDate", latestPerfect,@"latestPerfect",nil];
时间: 2023-12-03 16:03:17 浏览: 29
This is a method call in Objective-C that creates an NSDictionary object with three key-value pairs. The keys are "value", "latestDate", and "latestPerfect", and the corresponding values are passed as arguments to the method. The method returns the NSDictionary object.
相关问题
swift代码: if let keys = dic.allKeys as? [String], keys.contains("accumulatedReports") { let accumulatedReportsDic = dic.object(forKey: "accumulatedReports") as? NSDictionary let accumPerfectGoalAchievedDaysDic = accumulatedReportsDic?.object(forKey: "accumPerfectGoalAchievedDays") as? NSDictionary let value = accumPerfectGoalAchievedDaysDic?.object(forKey: "value") let latestDate = accumPerfectGoalAchievedDaysDic?.object(forKey: "latestDate") let latestPerfect = accumPerfectGoalAchievedDaysDic?.object(forKey: "latestPerfect") let dic = ["value": value, "latestDate": latestDate, "latestPerfect": latestPerfect] as? NSDictionary callback(dic as? [String : Any] ?? [:]) return } 如何用OC实现上述代码
可以使用 `NSDictionary` 和 `NSArray` 来实现上述 Swift 代码的功能,具体实现如下:
```
if ([dic.allKeys containsObject:@"accumulatedReports"]) {
NSDictionary *accumulatedReportsDic = [dic objectForKey:@"accumulatedReports"];
NSDictionary *accumPerfectGoalAchievedDaysDic = [accumulatedReportsDic objectForKey:@"accumPerfectGoalAchievedDays"];
id value = [accumPerfectGoalAchievedDaysDic objectForKey:@"value"];
id latestDate = [accumPerfectGoalAchievedDaysDic objectForKey:@"latestDate"];
id latestPerfect = [accumPerfectGoalAchievedDaysDic objectForKey:@"latestPerfect"];
NSDictionary *callbackDic = @{@"value": value ?: [NSNull null],
@"latestDate": latestDate ?: [NSNull null],
@"latestPerfect": latestPerfect ?: [NSNull null]};
callback(callbackDic);
return;
}
```
需要注意的是,由于 Objective-C 中没有类型推断功能,因此需要对上述代码中所有的 `id` 类型进行类型转换,以确保类型安全。此外,由于 Objective-C 中没有字典和数组的字面量语法,因此需要使用字典和数组的初始化方法来创建字典和数组。
nsdictionary 遍历
您好!对于遍历一个NSDictionary对象,您可以使用NSDictionary的allKeys属性获取所有的键,然后使用for-in循环遍历这些键来访问对应的值。以下是一个示例代码:
```objc
NSDictionary *dictionary = @{@"key1": @"value1", @"key2": @"value2", @"key3": @"value3"};
for (NSString *key in dictionary.allKeys) {
id value = dictionary[key];
NSLog(@"Key: %@, Value: %@", key, value);
}
```
上述代码会遍历NSDictionary对象中的每一个键,并打印出对应的键和值。您可以根据实际需求修改代码来执行其他操作。
希望能对您有所帮助!如果还有其他问题,请随时提问。