使用Swift打印领域数组中的特定值

我是Realm/Swift的新手，尝试做简单的打印。我有一个简单的代码：

//
//  ViewController.swift
//  Click
//

import UIKit
import RealmSwift

class ViewController: UIViewController {

    var testclick : Results<Click>?

    override func viewDidLoad() {
        super.viewDidLoad()

    }


    @IBAction func clickButton(sender: AnyObject) {

        do {

            let testclick = try Realm().objects(Click).filter("id == 1")

            // let totalclicks = testclick.totalclicks

            print(testclick)

        } catch {}

        let click = Click()
        click.id = 1
        click.totalclicks = 5
        click.name = "C. Boutrup"

        do {
            let realm = try Realm()

            try realm.write {
                realm.add(click, update: true)
            }

        } catch {}

    }
}

第二种解决方案：

//
//  ViewController.swift
//  Click
//

import UIKit
import RealmSwift

class ViewController: UIViewController {

    var testclick : Results<Click>?

    override func viewDidLoad() {
        super.viewDidLoad()

    }


    @IBAction func clickButton(sender: AnyObject) {

        do {

            // let testclick = try Realm().objects(Click).filter("id == 1")
            // let name = testclick.name
            // print(testclick)

            // Get a list of objects back out of Realm
            let results = try Realm().objects(Click).filter("id == 1")

            // Access the first object from the list (results[0] would also work)
            let testclick = results.first

            // Print its total clicks value
            print(testclick!.totalclicks)

            // trying
            let myclicks = testclick!.totalclicks

            let click = Click()
            click.id = 1
            click.totalclicks = myclicks + 1

            print(click.totalclicks)

            let realm = try Realm()

            try realm.write {
                realm.add(click, update: true)
            }

        } catch {}

    }
}

//
//ViewController.swift
//点击
//
导入UIKit
导入RealmSwift
类ViewController:UIViewController{
var testclick：结果？
重写func viewDidLoad（）{
super.viewDidLoad（）
}
@iAction func clickButton（发件人：AnyObject）{
做{
//让testclick=try Realm（）.objects（Click）.filter（“id==1”）
//让name=testclick.name
//打印（单击测试）
//从领域中获取对象列表
让results=try Realm（）.objects（单击）.filter（“id==1”）
//访问列表中的第一个对象（结果[0]也可以）
让testclick=results.first
//打印其总点击量值
打印（testclick！.totalclicks）
//尝试
让myclicks=testclick！.totalclicks
让单击=单击（）
单击0.id=1
click.totalclicks=myclicks+1
打印（点击。点击总数）
让realm=try realm（）
试试realm.write{
realm.add（单击，更新：true）
}
}捕获{}
}
}

如果“id”属性是对象的主键，可以尝试以下操作：

//
//  ViewController.swift
//  Click
//

import UIKit
import RealmSwift

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func clickButton(sender: AnyObject) {

        //initialize your realm
        let realm = try! Realm()

        //check if there is a Click with id == 1
        if let clickWithId1 = realm.objects(Click).filter("id == 1").first {
            do {
                //if there is a Click with id == 1, increment its totalclicks by 1 and update it

                try realm.write {
                    clickWithId1.totalclicks += 1
                    realm.add(clickWithId1, update: true)
                }

            } catch {}
        } else {  // if there is no Click with id == 1, create it and add it to realm
            let click = Click()
            click.id = 1
            click.totalclicks = 5
            click.name = "C. Boutrup"

            do {
                try realm.write {
                    realm.add(click, update: true)
                }

            } catch {}
        }
    }
}

---

在您的代码中，

testclick

将是一个

Results

对象，它将是用于查询的零个或多个结果的数组

要实际访问

单击
对象，首先需要将其从结果对象中取出

// Get a list of objects back out of Realm
let results = try Realm().objects(Click).filter("id == 1")

// Access the first object from the list (results[0] would also work)
let testclick = results.first

// Print its total clicks value 
print(testclick.totalclicks)

如果您需要更多的澄清，请告诉我！：）
 怎么会不行？因为它是在try内部定义的，而您尝试在外部使用它？我尝试了您的建议，构建成功，但单击按钮时出错：2016-02-10 09:49:58.798单击[4532:918521]***由于未捕获的异常“RLMEException”而终止应用程序，原因：“试图修改写入事务之外的对象-首先在RLMRealm实例上调用beginWriteTransaction。”将我们增加总点击数的行移到写入块中，您现在可以重试吗
//
//  ViewController.swift
//  Click
//

import UIKit
import RealmSwift

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func clickButton(sender: AnyObject) {

        //initialize your realm
        let realm = try! Realm()

        //check if there is a Click with id == 1
        if let clickWithId1 = realm.objects(Click).filter("id == 1").first {
            do {
                //if there is a Click with id == 1, increment its totalclicks by 1 and update it

                try realm.write {
                    clickWithId1.totalclicks += 1
                    realm.add(clickWithId1, update: true)
                }

            } catch {}
        } else {  // if there is no Click with id == 1, create it and add it to realm
            let click = Click()
            click.id = 1
            click.totalclicks = 5
            click.name = "C. Boutrup"

            do {
                try realm.write {
                    realm.add(click, update: true)
                }

            } catch {}
        }
    }
}

// Get a list of objects back out of Realm
let results = try Realm().objects(Click).filter("id == 1")

// Access the first object from the list (results[0] would also work)
let testclick = results.first

// Print its total clicks value 
print(testclick.totalclicks)