从api获取图像url null作为响应，有什么方法可以修复它吗？来自api的响应是：
"image_path" = "<null>";
试着这样处理：
if !(arrList.objectAtIndex(indexPath.row).valueForKey("media")?.objectAtIndex(0).valueForKey("image_path") is NSNull) {
// optional is NOT NULL, neither NIL nor NSNull
}
它还在撞击，请引导。更新：
发现问题，null其实不是问题。在下面发布回复以澄清问题。
media = (
{
id = "97eb48a0-429a-11e6-873c-ad7b848648f1";
"image_path" = "https://s3-eu-west-1.mazws.com/facebook_profile_images/15105131.png";
"room_post_id" = "97c572e0-429a-11e6-b72b-fd489f63a1fc";
"user_id" = "66fe22a0-4296-11e6-a1d9-69dc307add4b";
"video_path" = "<null>";
},
{
id = "981a6880-429a-11e6-b039-736a0bf954dc";
"image_path" = "<null>";
"room_post_id" = "97c572e0-429a-11e6-b72b-fd489f63a1fc";
"user_id" = "66fe22a0-4296-11e6-a1d9-69dc307add4b";
"video_path" = "https://s3-eu-west-1.naws.com/facebook_profile_images/1255803.mp4";
}
);
这是正常的响应，现在是出现问题的响应：
media = (
);
它能怎么处理吗？请引导。
这样尝试。。它不会使崩溃
if let imgPath = arrList.objectAtIndex(indexPath.row).valueForKey("media")?.objectAtIndex(0).valueForKey("image_path") as? String {
//... your value is string
}
让我根据您提供的信息猜测类型：
if let arrList = arrList as? NSArray,
firstObject = arrList.objectAtIndex(indexPath.row) as? NSDictionary,
media = firstObject.valueForKey("media") as? NSArray,
secondObject = media.objectAtIndex(0) as? NSDictionary,
image_path = secondObject.valueForKey("image_path") as? String {
print(image_path)
// now validate your string
}
验证你的字符串可以是这样的：
if !image_path.isEmpty && image_path != "<null>" {
//do something
}
或者像这样：
if !image_path.isEmpty {
if let image_pathURL = NSURL(string: image_path), _ = image_pathURL.host {
//do something
}
}
为什么不简单地使用==like:进行检查
if !(arrList.objectAtIndex(indexPath.row).valueForKey("media")?.objectAtIndex(0).valueForKey("image_path") == "<null>")
if let image = myJson["image_path"] as? String {
imageView.image = image
}
else {
imageview.image = "default.png"
}
也试试这个
if !(arrList.objectAtIndex(indexPath.row).valueForKey("media")?.objectAtIndex(0).valueForKey("image_path") == "<null>") {
// optional is NOT NULL, neither NIL nor NSNull
}