我是Swift的新手,本周刚开始学习关于CloudKit的iOS应用程序项目。
数据库正在运行,我可以添加记录并在数据库中查找记录。
我遇到了向CloudKit发送查询并访问与查询相关的数据的问题。
CloudKit数据具有唯一标识符,因此搜索其中一个标识符(因此查询应仅返回一条记录)。然后,我试图从该记录中获取三条信息 - " UPC"," foodName"," Ingredients" (所有字符串)
以下是执行查询并尝试获取数据的代码部分。
let publicDatabase = CKContainer.defaultContainer().publicCloudDatabase
let predicate = NSPredicate(format: "UPC = %@", subStr)
let query = CKQuery(recordType: "Food", predicate: predicate)
publicDatabase.performQuery(query, inZoneWithID: nil,
completionHandler: ({results, error in
if (error != nil) {
dispatch_async(dispatch_get_main_queue()) {
print("CloudKit Error")
}
} else {
if results!.count > 0 {
var record = results as! CKRecord
dispatch_async(dispatch_get_main_queue()) {
print("UPC Found")
let cloudUPC = record.objectForKey("UPC") as! CKAsset
print("UPC from CloudKit \(cloudUPC)")
}
} else {
dispatch_async(dispatch_get_main_queue()) {
print("UPC Not Found")
}
}
}
}))
此时发生崩溃
var record = results as! CKRecord
并返回" EXC_Breakpoint(代码= 1,子代码 - 0x10047b7c)
有关如何解决此问题的任何建议?
由于
答案 0 :(得分:1)
感谢rmaddy的建议。
这是我修复代码的方法
let publicDatabase = CKContainer.defaultContainer().publicCloudDatabase
let predicate = NSPredicate(format: "UPC = %@", subStr)
let query = CKQuery(recordType: "Food", predicate: predicate)
publicDatabase.performQuery(query, inZoneWithID: nil,
completionHandler: ({results, error in
if (error != nil) {
dispatch_async(dispatch_get_main_queue()) {
print("Cloud Error")
}
} else {
if results!.count > 0 {
dispatch_async(dispatch_get_main_queue()) {
for entry in results! {
let cloudUPC = entry["UPC"] as? String
print("UPC from CloudKit \(cloudUPC)")
let cloudFoodName = entry["foodName"] as? String
print("Name from CloudKit \(cloudFoodName)")
let cloudIngredients = entry["Ingredients"] as? String
print("Ingredients from CloudKit \(cloudIngredients)")
}
} else {
dispatch_async(dispatch_get_main_queue()) {
print("UPC Not Found")
}
}
}
}))
答案 1 :(得分:0)
你需要先写入记录中的项目循环然后打印每个UPC 那样:
for item in record {
print(item["UPC"]
print(item["foodName"]
}