UIWeb查看崩溃斯威夫特

Question

我使用webview

let url = NSURL(string: "") 
let request = NSURLRequest(URL: url!); webview.loadRequest(request) 

下使用。当我的第一个按钮单击该应用程序崩溃，即使它做派推出的web view

2016-01-17 21:04:45.632 HHKNBK[38603:34872679] Unknown class _TtC6HHKNBK6button in Interface Builder file. 2016-01-17 21:04:45.633 HHKNBK[38603:34872679] Unknown class _TtC6HHKNBK6button in Interface Builder file.fatal error: unexpectedly found nil while unwrapping an Optional value(lldb)

坏指令

Answer 1

使用条件解包来防止崩溃。

if let url = NSURL(string: "") { 
    let request = NSURLRequest(URL: url) 
    //... 
}