ios 在主线程上调用方法？
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Calling a method on the main thread?
提问by aryaxt
First of all I am writing code for iphone.
I need to be able to call a method on the main thread without using performSelectorOnMainThread.
The reason that I don't want to use performSelectorOnMainThreadis that it causes problem when I am trying to create a mock for unit testing.
首先，我正在为 iphone 编写代码。我需要能够在不使用performSelectorOnMainThread. 我不想使用的performSelectorOnMainThread原因是当我尝试为单元测试创建模拟时它会导致问题。
[self performSelectorOnMainThread:@Selector(doSomething) withObject:nil];
The problem is that my mock knows how to call doSomethingbut it doesn't know how to call performSelectorOnMainThread.
问题是我的模拟知道如何调用doSomething但它不知道如何调用performSelectorOnMainThread.
So Any solution?
所以有什么解决办法吗？
回答by aryaxt
Objective-C
目标-C
dispatch_async(dispatch_get_main_queue(), ^{
[self doSomething];
});
Swift
迅速
DispatchQueue.main.async {
self.doSomething()
}
Legacy Swift
旧版斯威夫特
dispatch_async(dispatch_get_main_queue()) {
self.doSomething()
}
回答by hotpaw2
There's a saying in software that adding a layer of indirection will fix almost anything.
软件中有一种说法，添加一个间接层几乎可以解决任何问题。
Have the doSomething method be an indirection shell that only does a performSelectorOnMainThread to call the really_doSomething method to do the actual Something work. Or, if you don't want to change your doSomething method, have the mock test unit call a doSomething_redirect_shell method to do something similar.
让 doSomething 方法成为一个间接 shell，它只执行 performSelectorOnMainThread 来调用 real_doSomething 方法来完成实际的 Something 工作。或者，如果您不想更改 doSomething 方法，请让模拟测试单元调用 doSomething_redirect_shell 方法来执行类似操作。
回答by Esqarrouth
Here is a better way to do this in Swift:
这是在 Swift 中执行此操作的更好方法：
runThisInMainThread { () -> Void in
// Run your code
self.doSomething()
}
func runThisInMainThread(block: dispatch_block_t) {
dispatch_async(dispatch_get_main_queue(), block)
}
Its included as a standard function in my repo, check it out: https://github.com/goktugyil/EZSwiftExtensions
它作为标准函数包含在我的 repo 中，请查看：https: //github.com/goktugyil/EZSwiftExtensions
回答by RomOne
And now in Swift 3:
现在在 Swift 3 中：
DispatchQueue.main.async{
self.doSomething()
}
回答by Muhammad Zeeshan
// Draw Line
func drawPath(from polyStr: String){
DispatchQueue.main.async {
let path = GMSPath(fromEncodedPath: polyStr)
let polyline = GMSPolyline(path: path)
polyline.strokeWidth = 3.0
polyline.strokeColor = #colorLiteral(red: 0.05098039216, green: 0.5764705882, blue: 0.2784313725, alpha: 1)
polyline.map = self.mapVu // Google MapView
}
}
