我试图检索和一个API显示的数据,但我不断收到这真是烦人运行时错误,我不知道发生了什么!运行时错误而下载和显示JSON数据
视图控制器文件:
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var valueLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
//set corner radius of value label
var buttonLayer: CALayer = valueLabel.layer
buttonLayer.masksToBounds = true
buttonLayer.cornerRadius = 5.0
getCurrentCryptoData()
}
func getCurrentCryptoData() -> Void {
let apiURL = NSURL(string: "https://www.allcrypt.com/api?method=cmcmarketdata")
let sharedSession = NSURLSession.sharedSession()
let downloadTask: NSURLSessionDownloadTask = sharedSession.downloadTaskWithURL(apiURL, completionHandler: { (apiData: NSURL!, response: NSURLResponse!, error: NSError!) -> Void in
let dataObject = NSData(contentsOfURL: apiData)
let cryptoDictionary: NSDictionary = NSJSONSerialization.JSONObjectWithData(dataObject, options: nil, error: nil) as NSDictionary
let omcvalues = Current(cryptoDictionary: cryptoDictionary)
self.valueLabel.text = "\(omcvalues.omcvalue)"
})
downloadTask.resume()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
我 'current.swift' 文件:
import Foundation
import UIKit
struct Current {
var omcvalue: Double
init(cryptoDictionary: NSDictionary) {
let all = cryptoDictionary["return"] as NSDictionary
let markets = all["markets"] as NSDictionary
let omcvalues = markets["OMC/BTC"] as NSDictionary
omcvalue = omcvalues["low_sell"] as Double
}
}
而且这是我想使用API源: api
我试图获得'OMC'值并存储'low_sell'属性,但我在运行时不断收到运行时错误。我想知道我是否正在访问字典,真的可以在这里使用一些帮助!
更新,增加了信息 我得到的错误是EXC_BREAKPOINT错误。 现在我知道我正在寻找正确的目录,因为当我将'low_sell'替换为'label'时,它一切正常,并且请求经过并被打印。只有当我切换到low_sell时。
错误代码如下:
libswiftCore.dylib`swift_dynamicCastObjCClassUnconditional:
0x10af95980: pushq %rbp
0x10af95981: movq %rsp, %rbp
0x10af95984: pushq %rbx
0x10af95985: pushq %rax
0x10af95986: movq %rsi, %rcx
0x10af95989: movq %rdi, %rbx
0x10af9598c: xorl %eax, %eax
0x10af9598e: testq %rbx, %rbx
0x10af95991: je 0x10af959ac ; swift_dynamicCastObjCClassUnconditional + 44
0x10af95993: movq 0x7f236(%rip), %rsi ; "isKindOfClass:"
0x10af9599a: movq %rbx, %rdi
0x10af9599d: movq %rcx, %rdx
0x10af959a0: callq 0x10af9846a ; symbol stub for: objc_msgSend
0x10af959a5: testb %al, %al
0x10af959a7: movq %rbx, %rax
0x10af959aa: je 0x10af959b3 ; swift_dynamicCastObjCClassUnconditional + 51
0x10af959ac: addq $0x8, %rsp
0x10af959b0: popq %rbx
0x10af959b1: popq %rbp
0x10af959b2: retq
0x10af959b3: leaq 0xc158(%rip), %rax ; "Swift dynamic cast failed"
0x10af959ba: movq %rax, 0x87427(%rip) ; gCRAnnotations + 8
0x10af959c1: int3
0x10af959c2: nopw %cs:(%rax,%rax)
这个运行时错误是...? – 2014-10-07 22:16:34
您应该提供有关您有哪些错误以及发生哪一行的更多详细信息。 – Antonio 2014-10-07 22:17:06