我对新的“throws”-“try”参数有疑问。
添加这些单词时出现错误,因此我在 IBAction 函数的末尾添加了“抛出”。
@IBAction func loginButtonPressed(sender: AnyObject)throws {//code here}
在里面我东东一些不相关的东西,然后这个:
let jsonData:NSDictionary = try NSJSONSerialization.JSONObjectWithData(urlData!, options:NSJSONReadingOptions.MutableContainers ) as! NSDictionary
之后没有错误,但是当我运行应用程序并单击按钮时,应用程序崩溃并显示代码
2015-06-15 10:43:11.374 BottLED[7283:1175818]-[BottLED.loginViewController loginButtonPressed:]:无法识别的选择器发送到实例 0x7fee28da7d20 2015-06-15 10:43:11.381 BottLED[7283:1175818] * 终止应用程序由于未捕获的异常'NSInvalidArgumentException',原因:'-[BottLED.loginViewController loginButtonPressed:]:无法识别的选择器发送到实例0x7fee28da7d20'*第一次抛出调用堆栈:(0 CoreFoundation 0x000000010d67c885 exceptionPreprocess + 165 1 libobjc.A.dylib 0x00000_exception_10thc0ed + 2 核心基础 0x000000010d684b5d -[NSObject(NSObject) 不识别选择器:] + 205 3 核心基础 0x000000010d5d1e3a ___forwarding_+ 970 4 CoreFoundation 0x000000010D19E8 _CF_FORWARDING_PREP_0 + 120 5 UIKIT 0x000000010DC46257- [UIAPPLICICATION sendaction:to to:to:to:From:Fromvent:Forevent:Forevent:] to:forEvent:] + 67 8 UIKit 0x000000010dda16c6 -[UIControl _sendActionsForEvents:withEvent:] + 272 9 UIKit 0x000000010dda08a9 -[UIControl touchesEnded:withEvent:] + 599 10 UIKit 0x000000010dcacbe8 -[UIForEvent:] + 835 11 UIKit 0x000000010dcad7d6 -[UIWindow sendEvent:] + 865 12 UIKit 0x000000010dc62705 -[UIApplication sendEvent:] + 263 13 UIKit 0x000000010dc3f5df _UIApplicationHandleEventQueue + 6031 14 CoreFoundation 0x000157001CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17 15 CoreFoundation 0x000000010d59ceac __CFRunLoopDoSources0 + 556 16 CoreFoundation 0x000000010d59c363 __CFRunLoopRun + 867 17 CoreFoundation 0x000000010d59bd78 CFRunLoopRunSpecific + 488 18 GraphicsServices 0x0000000111fdebca GraphicsServices + 52170 19 UIKit 0x000000010dc4479b UIApplicationMain + 171 20 BottLED 0x000000010c7cb9ad main + 109 21 libdyld.dylib 0x000000011029ca05 libdyld.dylib + 10757 22 ???0x0000000000000001 0x0 + 1 ) libc++abi.dylib: 以 NSException (lldb) 类型的未捕获异常终止
当我做一些断点并删除“抛出”时,应用程序不会崩溃。我现在真的不知道该怎么办..我希望有人能帮助我!
完整的代码是:
@IBAction func loginButtonPressed(sender: AnyObject)throws {
var name:NSString = textFieldName.text!
let pass:NSString = textFieldPw.text!
if ( name.isEqualToString("") || pass.isEqualToString("") ) {
let loginFailed = UIAlertView(title: "Failed to Signup",
message: "Please fill in all Textfields",
delegate: nil,
cancelButtonTitle: "OK")
loginFailed.show()
} else {
let post:NSString = "username=\(name)&password=\(pass)"
NSLog("PostData: %@",post);
let url:NSURL = NSURL(string: "my url")!
let postData:NSData = post.dataUsingEncoding(NSASCIIStringEncoding)!
let postLength:NSString = String( postData.length )
let request:NSMutableURLRequest = NSMutableURLRequest(URL: url)
request.HTTPMethod = "POST"
request.HTTPBody = postData
request.setValue(postLength as String, forHTTPHeaderField: "Content-Length")
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.setValue("application/json", forHTTPHeaderField: "Accept")
var reponseError: NSError?
var response: NSURLResponse?
var urlData: NSData?
do {
urlData = try NSURLConnection.sendSynchronousRequest(request, returningResponse:&response)
} catch let error as NSError {
reponseError = error
urlData = nil
}
if ( urlData != nil ) {
let res = response as! NSHTTPURLResponse!;
NSLog("Response code: %ld", res.statusCode);
if (res.statusCode >= 200 && res.statusCode < 300)
{
let responseData:NSString = NSString(data:urlData!, encoding:NSUTF8StringEncoding)!
NSLog("Response ==> %@", responseData);
let jsonData:NSDictionary = try NSJSONSerialization.JSONObjectWithData(urlData!, options:NSJSONReadingOptions.MutableContainers ) as! NSDictionary
let success:NSInteger = jsonData.valueForKey("success") as! NSInteger
//[jsonData[@"success"] integerValue];
NSLog("Success: %ld", success);
if(success == 1)
{