在 Swift 2.0 中,如果我执行以下操作:
panel.beginSheetModalForWindow(self.view.window!) { (result) in
switch result {
// Save was selected
case NSFileHandlingPanelOKButton:
self.writeFile(fileString, fileURL: panel.URL!)
// something else was selected
default:
break
}
}
使用如下函数,它编译并运行。
func writeFile(fileString: String, fileURL: NSURL) {
do {
try fileString.writeToURL(fileURL, atomically: true, encoding: NSUTF8StringEncoding)
} catch let error as NSError {
fatalError("Error writing to file - \(error)")
}
}
但是,如果我像这样将两者结合起来:
panel.beginSheetModalForWindow(self.view.window!) { (result) in
switch result {
// Save was selected
case NSFileHandlingPanelOKButton:
do {
try fileString.writeToURL(fileURL, atomically: true, encoding: NSUTF8StringEncoding)
} catch let error as NSError {
fatalError("Error writing to file - \(error)")
}
// something else was selected
default:
break
}
}
它不会编译。我收到一个编译器错误:
从“() throws ->”类型的抛出函数到非抛出函数类型“(Int) -> Void”的无效转换
为什么?
最佳答案
像这样添加默认的 catch block :
do {
try fileString.writeToURL(fileURL, atomically: true, encoding: NSUTF8StringEncoding)
} catch let error as NSError {
fatalError("Error writing to file - \(error)")
} catch {
}
http://www.hackingwithswift.com/new-syntax-swift-2-error-handling-try-catch
关于swift - 在 beginSheetModalForWindow 中尝试,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30828779/