我将此JSON代码存储在Core数据中：
{
"success":1,
"data":[
{
"activity_id":2,
"datetime":1501932600,
"athlete":{
"athlete_id":1,
"first_name":"Bram",
"last_name":"N"
},
"comments":[
{
"comment_id":1,
"athlete":{
"athlete_id":1,
"first_name":"Bram",
"last_name":"N"
},
"timestamp":1501876800,
"message":"Good job!"
},
{
"comment_id":3,
"athlete":{
"athlete_id":1,
"first_name":"Bram",
"last_name":"N"
},
"timestamp":1501876800,
"message":"Awesome"
}
],
"goals":[
{
"goal_id":1,
"sport_name":"Running",
"step":1,
"goal_name":"Duration",
"amount":30,
"data_displayed":{
"data_displayed_id":1,
"top_left":"Duration",
"top_right":"Distance",
"bot_left":"Heartrate",
"bot_right":"Pace"
},
"dataset":{
"dataset_id":1,
"duration":63,
"distance":11,
"calories":309,
"steps":5048,
"pace_min":4,
"pace_max":5,
"pace_avg":5,
"heartrate_min":90,
"heartrate_max":190,
"heartrate_avg":143,
"elevation":0,
"decrease":0
},
"locations":[
{
"location_id":1,
"latitude":50,
"longitude":50,
"timestamp":1501853400
},
{
"location_id":2,
"latitude":50,
"longitude":51,
"timestamp":1501853700
}
],
"splits_distance":[
{
"splits_distance_id":1,
"distance":1,
"duration":4
},
{
"splits_distance_id":2,
"distance":2,
"duration":5
}
],
"splits_duration":[
{
"splits_duration_id":1,
"duration":5,
"distance":0.87
},
{
"splits_duration_id":2,
"duration":10,
"distance":1.75
}
],
"graph_values":[
{
"graph_value_id":1,
"timestamp":1501853400,
"distance":0,
"calories":0,
"steps":0,
"heartrate":0,
"pace":0,
"elevation":0
},
{
"graph_value_id":2,
"timestamp":1501853700,
"distance":1.1,
"calories":50,
"steps":105,
"heartrate":132,
"pace":4.3,
"elevation":10
},
{
"graph_value_id":7,
"timestamp":1501854000,
"distance":1.8,
"calories":142,
"steps":264,
"heartrate":154,
"pace":4.8,
"elevation":8
},
{
"graph_value_id":8,
"timestamp":1501854300,
"distance":2.6,
"calories":209,
"steps":402,
"heartrate":143,
"pace":5.3,
"elevation":15
}
]
}
],
"images":[
{
"image_id":1,
"image_url":"www.trimeter.be\/image1"
}
],
"likes":[
{
"like_id":1,
"athlete":{
"athlete_id":1,
"first_name":"Bram",
"last_name":"N"
}
}
]
},
{
"activity_id":3,
"datetime":1502137043,
"athlete":{
"athlete_id":1,
"first_name":"Bram",
"last_name":"N"
},
"comments":[
{
"comment_id":4,
"athlete":{
"athlete_id":1,
"first_name":"Bram",
"last_name":"N"
},
"timestamp":1502149774,
"message":"Test message, please ignore"
}
],
"goals":[
{
"goal_id":2,
"sport_name":"Swimming",
"step":1,
"goal_name":"Distance",
"amount":1500,
"data_displayed":{
"data_displayed_id":3,
"top_left":"Dit",
"top_right":"Is",
"bot_left":"Iets",
"bot_right":"Anders"
},
"dataset":{
"dataset_id":2,
"duration":2,
"distance":2,
"calories":2,
"steps":2,
"pace_min":2,
"pace_max":2,
"pace_avg":2,
"heartrate_min":2,
"heartrate_max":2,
"heartrate_avg":2,
"elevation":2,
"decrease":2
},
"locations":[
],
"splits_distance":[
],
"splits_duration":[
],
"graph_values":[
]
},
{
"goal_id":3,
"sport_name":"Cycling",
"step":2,
"goal_name":"Distance",
"amount":40000,
"data_displayed":{
"data_displayed_id":2,
"top_left":"1",
"top_right":"2",
"bot_left":"3",
"bot_right":"4"
},
"dataset":{
"dataset_id":3,
"duration":3,
"distance":3,
"calories":3,
"steps":3,
"pace_min":3,
"pace_max":3,
"pace_avg":3,
"heartrate_min":3,
"heartrate_max":3,
"heartrate_avg":3,
"elevation":3,
"decrease":3
},
"locations":[
],
"splits_distance":[
],
"splits_duration":[
],
"graph_values":[
]
},
{
"goal_id":4,
"sport_name":"Running",
"step":3,
"goal_name":"Distance",
"amount":10000,
"data_displayed":{
"data_displayed_id":4,
"top_left":"1234",
"top_right":"5678",
"bot_left":"4321",
"bot_right":"8765"
},
"dataset":{
"dataset_id":4,
"duration":4,
"distance":4,
"calories":4,
"steps":4,
"pace_min":4,
"pace_max":4,
"pace_avg":4,
"heartrate_min":4,
"heartrate_max":4,
"heartrate_avg":4,
"elevation":4,
"decrease":4
},
"locations":[
],
"splits_distance":[
],
"splits_duration":[
],
"graph_values":[
]
}
],
"images":[
{
"image_id":2,
"image_url":"www.trimeter.be\/image2"
}
],
"likes":[
]
}
]
}
将数据存储在Core Data中后，我获取所有项目并将它们放入一个数组中以便以后使用。 由于这些项目没有按顺序保存，因此我使用它在数组的didSet中按时间戳排序：
allActivitiesArray = allActivitiesArray.sorted(by: { $0.timestamp > $1.timestamp })
现在我还需要对目标和评论进行排序，我该如何解决？我可以用上面的行以某种方式做到这一点吗？
我正在考虑做这样的事情：
for activity in allActivitiesArray {
var allGoals = activity.goals?.allObjects
allGoals = allGoals?.sorted(by: { ($0 as! Goal).id < ($1 as! Goal).id } )
}
然后将已排序的目标分配回活动，但它不会让我，因为我将[Any]分配给NSSet，所以我在这里丢失了一些。
非常感谢任何帮助/解释，谢谢！