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2019Iphone1
老師我想要用swift連線到mysql有哪先步驟。
要學的東西有哪些?
Xcode>上方工具選單product>Clean Build Folder
解決
剛剛想起我之前也有發生過
因為我Object-C與swift混用
導致不知道是不是xcode的bug
反正Clean Build Folder清除專案重新編譯就好了
但剛剛的狀況我直接開一個新專案
為什麼還會碰到這問題就不知道了
tofu2.zip
老師你好,我是睿誠,我找了許久卻不知道哪造成了當機
老師
我是許龍軒
我還沒看到上週日上的project7壓縮檔
我照上課步驟做了但還是出現一樣跑版的問題
想看看我的設定有哪裡沒注意到
謝謝
老師你好,我是睿誠,關於上次我在終端機輸入pod install有錯誤的問題,我後來有去網路找資料,它顯示的錯誤提示跟我的很像,以下是參考網址,但是看不懂他是如何解決的
https://medium.com/@yolk/cocoa-cocoapods-%E6%83%85%E5%A2%83%E5%8A%87-pod-install-%E5%A4%B1%E6%95%97-48af0d7af1fb
老師請問一下我的 View Controller 程式碼如下, 前一天執行沒問題,重新開啟檔案後執行就不能變成綠色了,如圖檔
class ViewController: UIViewController {
@IBOutlet var messageLabel:UILabel!
@IBOutlet var newButton:UIButton!
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.systemGreen
messageLabel.text = "Hello, iPhone"
newButton.setTitle("press me", for: .normal)
老師好
我是第一堂課的龍軒
今天才回來看12/12下午第二堂課的回播
看到老師在這堂課教的Optional binding
其中一直有提到java或其他語言都沒有這個常數為nil的判斷防呆
這個概念是SWIFT才有的
我想問一下
我之前是寫C#的
他們有個Int.TryParse(字串, out 變數)
若字串成功判斷可以轉為int
則將變數指定為轉成int的數值
若無法轉成int的字串
則執行else的程式區段
那C#的這個指令跟Swift的Optional binding是否為一樣的指令呢
還是說執行中有些底層的邏輯不同之類的
tofu2.1.zip
老師你好,我是睿誠,找了很久找不出當機原因
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