使用Firebase自定义多个UIImagePicker [英] Custom multiple UIImagePicker using Firebase
本文介绍了使用Firebase自定义多个UIImagePicker的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个图像数组 var images：NSArray！ = [] ，用一个自定义的UIImagePicker收集最多五个图像。我需要将图像发送到Firebase，但Firebase不接受数组，因此我将数组的每个索引转换为它自己的UIImage：
<$ c $让imageOne = images [0]为？ UIImage
让imageTwo = images [1]为？ UIImage
让imageThree = images [2]为？ UIImage
让imageFour = images [3]为？ UIImage
让imageFive = images [4]为？ UIImage
然后我创建了一个函数将图片发送到firebase：
func uploadImage（image：UIImage）{
var randomName = randomStringWithLength（length：5）
let imageData = UIImageJPEGRepresentation（imageOne !, 1.0 ）
let imageDatas = UIImageJPEGRepresentation（imageTwo !, 1.0）
let imageDataThree = UIImageJPEGRepresentation（imageThree !, 1.0）
let imageDataFour = UIImageJPEGRepresentation（imageFour !, 1.0）
let imageDataFive = UIImageJPEGRepresentation（imageFive !, 1.0）
let uploadRef = FIRStorage.storage（）。reference（）。child（images / \（randomName）.jpg）
（ImageData，元数据：nil）{元数据，
错误
if error ==零{
print（成功上传的图像）
self.imageFileName =\（randomName as String）.jpg
randomNameName = randomStringWithLength（length：5）
$ b let uploadRef2 = FIRStorage.storage（）。reference（）。child（images / \（randomName）.jpg）$ b $如果错误== nil {
self.imageFileNameTwo（
$ upload
$ upload
$ upload
$ upload $ =\（randomName as String）.jpg
} else {
print（Error upload upload image）
}
randomName = randomStringWithLength（length：5）
$ b $ uploadRef3 = FIRStorage.storage（）。reference（）。child（images / \（randomName）.jpg）
guard let imageDataThrees = imageDataThree else {return}
uploadRef3.put（imageDataThrees，元数据：nil）{元数据，
错误
if error == nil {
self.imageFileNameThree =\（randomName as String）.jpg
} else {
print（Error upload upload image）
}
randomName = randomStringWithLength （长度：5）
let uploadRef4 = FIRStorage.storage（）。reference（）。child（images / \（randomName）.jpg）
guard imageDataFours = imageDataFour else {return} $ b $ uploadRef4.put（imageDataFours，metadata：nil）{metadata，
error in
if error == nil {
self.imageFileNameFour =\\ \\（随机名作为字符串）.jpg
其他{
print（Error upload upload image）
}
randomName = randomStringWithLength（length：5）
let image uploadFile = imageDataFive else {return} $ b $ uploadRef5.put（imageDataFives，如果错误== nil {
AppDelegate.instance（）。dismissActivityIndicator（）
self.imageFileNameFive =\（randomName as字符串）.jpg
else {
print（Error upload upload image）
}
let postObject：Dictionary< String，Any> = [
image：self.imageFileName，
imageTwo：self.imageFileNameTwo，
imageThree：self.imageFileNameThree，
imageFour： self.imageFileNameFour，
imageFive：self.imageFileNameFive，
$ b FIRDatabase.database（）。reference（）。child（ （错误上传图片）
（）（））。child（self.loggedInUser！.uid）.child（key）.setValue（postObject）
}}}}} else {
print
}}
$ b}
如果让pickImageFirst = imageOne，
let pickedImageSecond = imageTwo，
let pickedImageThird = imageThree，
let pickedImageFour = imageFour，
let pickedImageFive = imageFive {
uploadImage（image：pickedImageFirst）
这个函数需要用户总是5个图像，否则会崩溃。不过，我希望它是可选的。这样用户可以选择一个或五个图像。现在，如果我选择少于5个图像，我得到这个崩溃：
由于未捕获异常'NSRangeException'终止应用程序，原因：' - [__ NSSingleObjectArrayI objectAtIndex ：]：index 1 beyond bounds [0..0]'
解决方案 c> guard 语句，而不是强制在一个地方展开所有图像。
guard let imageData = imageData else {return}
uploadRef.put（imageData，metadata：nil）{metadata，如果错误== nil {
print（successfully uploaded Image）
self.imageFileName =\（randomName as String）.jpg
randomName = randomStringWithLength（length：5）
let uploadRef2 = FIRStorage.storage（）。reference（）。child（images / \（randomName）.jpg）
guard imageDatas = imageDatas else {return}
uploadRef2.put（imageDatas，metadata：nil）{metadata
等等通过你的函数。
I have an image array var images: NSArray! = [] that collects a max of five images with a custom UIImagePicker. I need to send the images to Firebase, but Firebase does not accept arrays so I turned each index of the array into its own UIImage:
let imageOne = images[0] as? UIImage
let imageTwo = images[1] as? UIImage
let imageThree = images[2] as? UIImage
let imageFour = images[3] as? UIImage
let imageFive = images[4] as? UIImage
Then I created a function to send the images to firebase:
func uploadImage(image: UIImage){
var randomName = randomStringWithLength(length: 5)
let imageData = UIImageJPEGRepresentation(imageOne!, 1.0)
let imageDatas = UIImageJPEGRepresentation(imageTwo!, 1.0)
let imageDataThree = UIImageJPEGRepresentation(imageThree!, 1.0)
let imageDataFour = UIImageJPEGRepresentation(imageFour!, 1.0)
let imageDataFive = UIImageJPEGRepresentation(imageFive!, 1.0)
let uploadRef = FIRStorage.storage().reference().child("images/\(randomName).jpg")
guard let ImageData = imageData else { return }
uploadRef.put(ImageData, metadata: nil) { metadata,
error in
if error == nil {
print("successfully uploaded Image")
self.imageFileName = "\(randomName as String).jpg"
randomName = randomStringWithLength(length: 5)
let uploadRef2 = FIRStorage.storage().reference().child("images/\(randomName).jpg")
guard let Imagedatas = imageDatas else { return }
uploadRef2.put(Imagedatas, metadata: nil) { metadata,
error in
if error == nil {
self.imageFileNameTwo = "\(randomName as String).jpg"
} else{
print("Error uploading image")
}
randomName = randomStringWithLength(length: 5)
let uploadRef3 = FIRStorage.storage().reference().child("images/\(randomName).jpg")
guard let imageDataThrees = imageDataThree else { return }
uploadRef3.put(imageDataThrees, metadata: nil) { metadata,
error in
if error == nil {
self.imageFileNameThree = "\(randomName as String).jpg"
} else{
print("Error uploading image")
}
randomName = randomStringWithLength(length: 5)
let uploadRef4 = FIRStorage.storage().reference().child("images/\(randomName).jpg")
guard let imageDataFours = imageDataFour else { return }
uploadRef4.put(imageDataFours, metadata: nil) { metadata,
error in
if error == nil {
self.imageFileNameFour = "\(randomName as String).jpg"
} else{
print("Error uploading image")
}
randomName = randomStringWithLength(length: 5)
let uploadRef5 = FIRStorage.storage().reference().child("images/\(randomName).jpg")
guard let imageDataFives = imageDataFive else { return }
uploadRef5.put(imageDataFives, metadata: nil) { metadata,
error in
if error == nil {
AppDelegate.instance().dismissActivityIndicator()
self.imageFileNameFive = "\(randomName as String).jpg"
} else{
print("Error uploading image")
}
let postObject: Dictionary<String, Any> = [
"image" : self.imageFileName,
"imageTwo" : self.imageFileNameTwo,
"imageThree" : self.imageFileNameThree,
"imageFour" : self.imageFileNameFour,
"imageFive" : self.imageFileNameFive,
]
FIRDatabase.database().reference().child("posts").child(self.loggedInUser!.uid).child(key).setValue(postObject)
}}}}} else{
print("Error uploading image")
}}
}
if let pickedImageFirst = imageOne,
let pickedImageSecond = imageTwo,
let pickedImageThird = imageThree,
let pickedImageFour = imageFour,
let pickedImageFive = imageFive {
uploadImage(image: pickedImageFirst)
This function requires the user to always 5 images otherwise it crashes. However, I want it to be optional. So that a user can select between one or five images. Right now if I select less than 5 images, I get this crash:
Terminating app due to uncaught exception 'NSRangeException', reason: ' -[__NSSingleObjectArrayI objectAtIndex:]: index 1 beyond bounds [0 .. 0]'
解决方案
You could use guard statements instead of force unwrapping all you images in one place.
guard let imageData = imageData else { return }
uploadRef.put(imageData, metadata: nil) { metadata,
error in
if error == nil {
print("successfully uploaded Image")
self.imageFileName = "\(randomName as String).jpg"
randomName = randomStringWithLength(length: 5)
let uploadRef2 = FIRStorage.storage().reference().child("images/\(randomName).jpg")
guard let imageDatas = imageDatas else { return }
uploadRef2.put(imageDatas, metadata: nil) { metadata
And so on through your function.
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