当图片不存在时崩溃保存我的个人资料iOS

Question

I'm having some trouble when I press the button save to edit the profile :

for example the image don't exist and when I press save button, it's crash, please find below my code? what am I missing ?

Once I remove the condition if the profile image don't exist my code work..

  let profileImageData = UIImageJPEGRepresentation(imageUser.image!, 0.0) //--------------------------------------- // Check if all fields are empty //--------------------------------------- if (Name.text!.isEmpty && Username.text!.isEmpty && website.text!.isEmpty && aboutUser.text!.isEmpty && emailUser.text!.isEmpty && phoneUser.text!.isEmpty && genderUser.text!.isEmpty && (profileImageData == nil)) { print("error") } 

Answer 1

You are force unwrapping the contents of the variable imageUser.image in the first line of code you posted. When you do this, it will crash your application if the value of imageUser.image is nil . I suggest you check out the section on Optionals in The Swift Programming Language (Swift 2.0) .

If imageUser.image can be nil, this is a more correct version of your code. Note the use of an if let statement to safely unwrap the contents of imageUser.image . It's worth mentioning that every place you're using a ! in your code below, will crash if that value you're using it on is nil (which is why this code only more correct and not fully correct).

if let profileImage = imageUser.image {
    let profileImageData = UIImageJPEGRepresentation(profileImage, 0.0)

    //---------------------------------------
    // Check if all fields are empty
    //---------------------------------------


    if (Name.text!.isEmpty && Username.text!.isEmpty && website.text!.isEmpty && aboutUser.text!.isEmpty && emailUser.text!.isEmpty && phoneUser.text!.isEmpty && genderUser.text!.isEmpty && (profileImageData == nil)) {
        print("error")

    }
}
else {
    print("image was nil")
}