我有一个图像数组 var images: NSArray! = []
我数组中的最大图像数是 5 张图像。我希望能够处理任意数量的图像,所以我提取了它们
guard let imageOne = images[0] as? UIImage else { return }
guard let imageTwo = images[1] as? UIImage else { return }
guard let imageThree = images[2] as? UIImage else { return }
guard let imageFour = images[3] as? UIImage else { return }
guard let imageFive = images[4] as? UIImage else { return }
我希望每个索引都是可选的,因此我可以使用 imageOne 或 imageOne 和 imageTwo,但是当我尝试使用少于 5 个图像时,我会收到索引错误。如何使每个索引成为可选的,以便它不再与数组组合在一起,并且每个索引都成为自己的图像。
我最初有一个数组,因为我有一个只接受数组的自定义 UIImagePicker,但我想将图像上传到 Firebase,而 Firebase 不接受数组,所以我必须从数组中提取图像。
使用下面的建议答案,我对我的代码做了这个:
for (counter, img) in images.enumerated(){
if counter == 0 {
func uploadImage(image: UIImage){
var randomName = randomStringWithLength(length: 5)
let imageData = UIImageJPEGRepresentation(imageOne!, 1.0)
let uploadRef = FIRStorage.storage().reference().child("images/\(randomName).jpg")
uploadRef.put(img as! UIImage, metadata: nil) { metadata,
error in
if error == nil {
print("successfully uploaded Image")
self.imageFileName = "\(randomName as String).jpg"
randomName = randomStringWithLength(length: 5)
let postObject: Dictionary<String, Any> = [
"image" : self.imageFileName,
]
FIRDatabase.database().reference().child("posts").child(self.loggedInUser!.uid).child(key).setValue(postObject)
print("Posted to Firebase. ")
} else{
print("Error uploading image")
}}
}
if let pickedImage = img as?
UIImage{
uploadImage(image: pickedImage)
}
}
}
现在,我如何检查选择了多少图像并在每个 if counter == num
最佳答案
虽然我不同意您的处理方式,但这将回答您的问题:
首先更改var images: NSArray! = []
到 var images: NSMutableArray! = []
while images.count < 5{
images.addObject(UIImage())
}
guard let imageOne = images[0] as? UIImage else { return }
guard let imageTwo = images[1] as? UIImage else { return }
guard let imageThree = images[2] as? UIImage else { return }
guard let imageFour = images[3] as? UIImage else { return }
guard let imageFive = images[4] as? UIImage else { return }
关于ios - 从图像数组中快速删除图像,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/44682024/