英文:
How to pass a parameter to a block executed asynchronously in Swift?
问题
除了function dispatch_async，该函数用于提交一个块以异步执行，iOS还提供了另一个function dispatch_async_f，用于提交一个带有单个参数的函数以异步执行。
在Swift中，我可以调用dispatch_async，如DispatchQueue.global().async {}，但我没有找到任何调用dispatch_async_f的方法。
那么，我如何将参数传递给异步执行的块？
英文:
In addition to function dispatch_async, that submits a block for asynchronous execution, iOS provides another function dispatch_async_f to submit a function with a single parameter for asynchronous execution.
in Swift, I can call dispatch_async as DispatchQueue.global().async {}, but I did not find any way to call dispatch_async_f.
So, how do I pass a parameter to a block executed asynchronously?
答案1
得分: 1
dispatch_async_f()可以在没有块或闭包的C代码中使用。
在Swift中，您只需传递一个闭包，闭包调用该函数：
DispatchQueue.global().async {
let theParameter = ...
theFunction(theParameter)
}
闭包还可以在创建时捕获值：
let theParameter = ...
DispatchQueue.global().async {
theFunction(theParameter)
}
英文:
dispatch_async_f() can be used in C code, which has no blocks or closures.
In Swift you simply pass a closure, and the closure calls the function:
DispatchQueue.global().async {
let theParameter = ...
theFunction(theParameter)
}
The closure can also capture values when created:
let theParameter = ...
DispatchQueue.global().async {
theFunction(theParameter)
}
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