大家好，我是新手，我在我的程序中面臨一個問題。我已經在'保存了一些數據，讓defaultStudentId = NSUserDefaults.standardUserDefaults（）'，但每次應用程序停止。 defaultStudentId.objectForKey（ 「studentId」）這個 「studentId」 從另一個視圖控制器來了....我需要幫助 這裏是我的代碼和錯誤.....swift中的NSRangeException
import UIKit
class OTPViewController: ViewController {
@IBOutlet weak var OTP_code: UITextField!
let defaultStudentId = NSUserDefaults.standardUserDefaults()
override func viewDidLoad() {
super.viewDidLoad()
}
@IBAction func confirm(sender: AnyObject) {
let std_id = defaultStudentId.objectForKey("studentId")
let sendOTPCode = "StudentId=\(std_id)&CODE=\(self.OTP_code.text)&PartnerID=4B67B239CF3735814C063DB89D750481"
let url = NSURL(string: "http://serviceforonair.examonair.com/AndroidService.asmx/VerifyOTPAndActivateStudent")
let request = NSMutableURLRequest(URL: url!)
request.HTTPMethod = "POST"
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.HTTPBody = sendOTPCode.dataUsingEncoding(NSUTF8StringEncoding)
let task = NSURLSession.sharedSession().dataTaskWithRequest(request){data, response, error in
if error != nil{
print(error)
return
}
do{
let responseString = NSString(data: data!, encoding: NSUTF8StringEncoding)
var message : String!
message = responseString?.stringByReplacingCharactersInRange(NSMakeRange(0, 76), withString: "").stringByReplacingOccurrencesOfString("</string>", withString: "")
print(self.defaultStudentId)
}
catch let jsonException{
print(jsonException)
}
}
task.resume()
}
}
錯誤 2016- 08-15 20：14：10.555 DBMCI [21415：143621] *由於未捕獲異常'NSRangeException'，原因：' - [__ NSCFString replaceCharactersInRange：withString：]：範圍或索引超出範圍' *第一次拋出調用堆棧： （ 0 CoreFoundation 0x000000010dcedd85 exceptionPreprocess + 165 1 libobjc.A.dylib 0x0000000110159deb objc_exception_throw + 48 2的CoreFoundation 0x000000010dcedcbd + [NSException提高：格式：] + 205 3的CoreFoundation 0x000000010dcb90ad mutateError + 221 4基金會0x000000010e7c887c - [NSString的stringByReplacingCharactersInRange：withString：] + 142 5 DBMCI 0x000000010d62de96 _TFFC5DBMCI17OTPViewController7confirmFPs9AnyObject_T_U_FTGSqCSo6NSData_GSqCSo13NSURLResponse_GSqCSo7NSError__T_ + 902 6 DBMCI 0x000000010d622c87 _TTRXFo_oGSqCSo6NSData_oGSqCSo13NSURLResponse_oGSqCSo7NSError__dT__XFdCb_dGSqS__dGSqS0__dGSqS1___dT + 103 7 CFNetwork的0x0000000111118b49 75 - [__ NSURLSessionLocal taskForClass：請求：uploadFile：bodyData：完成：] _ block_invoke + 1 9 8 CFNetwork的0x000000011112b0f2 __49 - [__ NSCFLocalSessionTask _task_onqueue_didFinish] _block_invoke + 302 9基金會0x000000010e82f630 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK + 7 10基金會0x000000010e76a805 - [NSBlockOperation主] + 101 11基金會0x000000010e74d725 - [__ NSOperationInternal _start：] + 646 12基金會0x000000010e74d336 __NSOQSchedule_f + 194 13 libdispatch.dylib 0x000000011197a3eb _dispatch_client_callout + 8 14 libdispatch.dylib 0x000000011196082c _dispatch_queue_drain + 2215 15 libdispatch.dylib 0x000000011195fd4d _dispatch_queue_invoke + 601 16 libdispatch.dylib 0x0000000111962996 _dis patch_root_queue_drain + 1420 17 libdispatch.dylib 0x0000000111962405 _dispatch_worker_thread3 + 111 18 libsystem_pthread.dylib 0x0000000111cb74de _pthread_wqthread + 1129 19 libsystem_pthread.dylib 0x0000000111cb5341 start_wqthread + 13 ） 的libC++ abi.dylib：與類型的未捕獲的異常NSException 終止（LLDB ）