源代码如下
let json = try NSJSONSerialization.JSONObjectWithData(data!,options: .AllowFragments)
if let blogs = json["profile_image_url"] as? String {
userImage = blogs//json["profile_image_url"] as! String
print("USER IMAGE:\(userImage)")
我是如何解决这个问题的
解决方法
您希望在使用之前测试和解包任何Optional.这包括像？的演员表.如果你可以避免它,你不应该使用强制解包或显式解包的Optional(用！标记),因为它们会导致意外的运行时崩溃.
import Foundation
// create test data
let testJson = ["profile_image_url": "http://some.site.com/"]
var data: NSData?
// convert to NSData as JSON
do {
data = try NSJSONSerialization.dataWithJSONObject(testJson,options: [])
} catch let error as NSError {
print(error)
}
// decode NSData
do {
// test and unwrap data
if let data = data {
let json = try NSJSONSerialization.JSONObjectWithData(data,options: .AllowFragments)
// test and unwrap cast to String
if let userImage = json["profile_image_url"] as? String {
print("USER IMAGE:\(userImage)")
}
}
} catch let error as NSError {
print(error)
}
