1.Downcast from 'UIViewController' only unwraps optionals;did you mean to use'!'?

原： ?let view = mainStory.instantiateInitialViewController() as! UIViewController

? window?.rootViewController = view

修改：

　　　if let view = mainStory.instantiateInitialViewController(){?

? ? ? ? ? ? window?.rootViewController = view

? ? ? ? }

2.Call can throw, but it is not marked with 'try' and the error is not handled 或者?ambiguous reference to member 'appendpartwithfileurl'

原：formData.appendPartWithFileURL(filePath, name:?"file")

修改：do {

? ? ? ?try formData.appendPartWithFileURL(filePath, name: "file")

} catch {

// TODO: handle error

}

3.Cannot convert value of type '[String : String?]' to expected argument type 'AnyObject?'

原：

let params = [?"url": urlTf.text?]

修改：let?params = [?"url":?urlTf.text ??? ""?]

4.storyboard?minimum font size greater than current font size

修改：在 inspector 下 修改 autoshrink fixed font size

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轉(zhuǎn)載于:https://www.cnblogs.com/-yfan/p/5223142.html

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