小编Md.*_*san的帖子

有问题的应用程序可以让用户将项目标记为收藏.当用户没有保存的收藏夹时,我想通知他们这个事实(大多数我讨厌空白tableView的想法).

numberOfRowsInSection当没有用户标记为收藏的项目时,我为零.我想设置cell.textLabel.text = @"你没有收藏夹"但是当没有项目cellForRowAtIndexPath没有被调用时.

我可以测试numberOfRowsInSection在遇到0时给出结果然后测试1行cellForRowAtIndexPath然后插入自定义文本但是如果他们只有一个喜欢的话会怎样？

UPDATE

我尝试实现上面的想法,并在下面推荐,但也许我做得不对,可能是因为它是一个fetchedResultsController,其中委托方法在发生更改时更新表.

当表中只有一个单元格删除单元格时,我收到此错误:

*** Assertion failure in -[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit_Sim/UIKit-1447.6.4/UITableView.m:976 Serious application error. An exception was caught from the delegate of NSFetchedResultsController during a call to -controllerDidChangeContent:. Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (1) must be equal to the number of rows contained in that section before the update (1), plus or minus …

我正在尝试从 spring boot gradle 项目创建对 mongo 数据库的动态查询。我的gradle版本：5.6.1

这是我的 build.gradle 文件：

plugins {
    id 'org.springframework.boot' version '2.2.2.RELEASE'
    id 'io.spring.dependency-management' version '1.0.8.RELEASE'
    id 'java'
}

group = 'com.onssoftware'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'

repositories {
    mavenCentral()
}

dependencies {

    implementation 'org.springframework.boot:spring-boot-starter-web'
    implementation 'org.springframework.boot:spring-boot-starter-data-mongodb'

    // https://mvnrepository.com/artifact/com.querydsl/querydsl-mongodb
    compile group: 'com.querydsl', name: 'querydsl-mongodb', version: '4.2.2'

    // https://mvnrepository.com/artifact/com.querydsl/querydsl-apt
    compile group: 'com.querydsl', name: 'querydsl-apt', version: '4.2.2'
    //annotationProcessor group: 'com.querydsl', name: 'querydsl-apt', version: '4.2.2'

    annotationProcessor "com.querydsl:querydsl-apt:4.2.2"
    //annotationProcessor("org.springframework.data.mongodb.repository.support.MongoAnnotationProcessor")

    testImplementation('org.springframework.boot:spring-boot-starter-test') {
        exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
    }
}

test …

我想在swift中编写一个协议

@objc protocol RestAPIManagerDelegate {

      optional func credentialValidated(isValid: Bool?)
}

但我收到以下错误:

'Method cannot be marked @objc because the type of the parameter cannot be represented in Objective-C'

有什么建议吗？

我从终端本地调用 Rest API。就像下面这样：

http -v -f --timeout=60 GET 'http://localhost:8080/api/v1/public/users/signin?email=myemail@email.com&password=mypassword'

它返回以下输出：

GET /api/v1/public/users/signin?email=myemail@email.com&password=mypassword HTTP/1.1
Accept: */*
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=utf-8
Host: localhost:8080
User-Agent: HTTPie/0.8.0



HTTP/1.1 400 Bad Request
Content-Type: application/json
Date: Mon, 28 Mar 2016 16:59:08 GMT
Set-Cookie: rememberMe=deleteMe; Path=/; Max-Age=0; Expires=Sun, 27-    Mar-2016 16:59:13 GMT
Transfer-Encoding: chunked

{
    "debugMessage": "Submitted credentials for token     [org.apache.shiro.authc.UsernamePasswordToken - najmul@qianalysis.com, rememberMe=true] did not match the expected credentials.Submitted credentials for token [org.apache.shiro.authc.UsernamePasswordToken - najmul@qianalysis.com, rememberMe=true] did not match the expected credentials.: The subject …

我所做的是：

1. 使用Web，JPA，MySQL和Quartz作为依赖项创建了一个Spring Boot（v2.1.8）Gradle项目。
2. 然后在application.properties文件中添加了以下属性

spring.application.name=QuartzTestWithMySQL
server.port=8081

## Data source
#docker run -d --rm -p 3306:3306 --name=mysql-docker -e MYSQL_ROOT_PASSWORD=root -e MYSQL_USER=test -e MYSQL_PASSWORD=test -e MYSQL_DATABASE=testDB mysql:latest
spring.datasource.name = myDS
spring.datasource.url=jdbc:mysql://localhost:3306/testDB
spring.datasource.username=test
spring.datasource.password=test

## Hibernate Properties
spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true
# The SQL dialect makes Hibernate generate better SQL for the chosen database
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
# Hibernate ddl auto (create, create-drop, validate, update)
spring.jpa.hibernate.ddl-auto = create-drop

## QuartzProperties
#spring.quartz.job-store-type=memory
spring.quartz.job-store-type=jdbc
spring.quartz.properties.org.quartz.threadPool.threadCount=5
#spring.quartz.jdbc.initialize-schema=always

#spring.quartz.properties.org.quartz.scheduler.instanceName = MyScheduler
#spring.quartz.properties.org.quartz.threadPool.threadCount = 3
#spring.quartz.properties.org.quartz.jobStore.class = org.quartz.simpl.RAMJobStore

spring.quartz.properties.org.quartz.jobStore.class = org.quartz.impl.jdbcjobstore.JobStoreTX …