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插入数据
在SwiftData 中插入数据非常简单，默认情况下数据会自动保存，无需手动调用保存操作。以下示例演示了如何创建一个 Student 模型并插入一条记录，数据将自动保存： @Model class Student { var n...
如何动态更改查询的排序顺序或谓词
要实现动态排序，您需要将@Query属性移至 SwiftUI 层次结构中的视图中 - 您需要将其放入子视图中，在其中可以使用依赖项注入提供排序值。 这意味着创建一个新的 SwiftUI，它使用@Query来显示您...
SwiftData 调试
SwiftData 在调试时可以直接在输出窗口显示对应的 SQL 语句。 设置方法 点击如下的按钮，弹出 Scheme 窗口 在弹出的Scheme 窗口中，选择 Run菜单，然后选择 Argument 标签页，点击+号按钮。 然...
Transaction
当前状态处理更新的上下文。 transaction(value:_:) 使用.transaction 修饰符来更改或替换视图中使用的动画。考虑一个由按钮控制的三个相同视图，同时改变所有三个的情况： 第一个视图通过旋转...
How to create and call an async function如何创建和调用异步函数
Using async functions in Swift is done in two steps: declaring the function itself as being async, then calling that function using await.在 Swift 中使用异步函数分两步完...
How to create and use async properties 如何创建和使用异步属性
Just as Swift’s functions can be asynchronous, computed properties can also be asynchronous: attempting to access them must also use await or similar, and may also need&...
How to fix the error “async call in a function that does not support concurrency” 如何修复错误 “async call in a function that does not support concurrency”
This error occurs when you’ve tried to call an async function from a synchronous function, which is not allowed in Swift – asynchronous functions must be able to suspend the...
How to create a custom AsyncSequence 如何创建自定义 AsyncSequence
There are only three differences between creating an AsyncSequence and creating a regular Sequence, none of which are complicated.创建 AsyncSequence 和创建...
How to create and use AsyncStreams to return buffered data 如何创建和使用 AsyncStreams 返回缓冲数据
AsyncStream and AsyncThrowingStream can be thought of a bit like continuations that can send back multiple values, but also like an AsyncSequence that is a...
How to make a task sleep 如何使任务进入休眠状态
Swift’s Task struct has a static sleep() method that will cause the current task to be suspended for a set period of time. You need to call Task.sleep()&n...
