如何压缩缩小图像的大小,然后上传到Parse作为PFFile？ (迅速)

概述我直接在手机上拍照后尝试上传一个图像文件到Parse。但它抛出一个例外： Terminating app due to uncaught exception ‘NSInvalidArgumentException’, reason: ‘PFFile cannot be larger than 10485760 bytes’ 这里是我的代码： 在第一个视图控制器： override func pre 我直接在手机上拍照后尝试上传一个图像文件到Parse。但它抛出一个例外：

Terminating app due to uncaught exception ‘NSinvalidargumentexception’,reason: ‘PFfile cannot be larger than 10485760 bytes’

这里是我的代码：

在第一个视图控制器：

overrIDe func prepareForSegue(segue: UIStoryboardSegue,sender: AnyObject?) {    if (segue.IDentifIEr == "getimage")    {        var svc = segue.destinationVIEwController as! ClothesDetail        svc.imagePassed = imageVIEw.image    }}

在视图控制器中上传图片：

let imageData = UIImagePNGRepresentation(imagePassed)let imagefile = PFfile(name: "\(picname).png",data: imageData)var userpic = PFObject(classname:"UserPic")userpic["picImage"] = imagefile`

但我仍然需要将这张照片上传到Parse。有没有办法减少图像的大小或分辨率？

是的，您可以使用UIImageJPEGRepresentation而不是UIImagePNGRepresentation来减少您的图像文件大小。您可以只创建一个扩展UIImage如下：

Xcode 8.2•Swift 3.0.2

extension UIImage {    enum JPEGQuality: CGfloat {        case lowest  = 0        case low     = 0.25        case medium  = 0.5        case high    = 0.75        case highest = 1    }    /// Returns the data for the specifIEd image in PNG format    /// If the image object’s underlying image data has been purged,calling this function forces that data to be reloaded into memory.    /// - returns: A data object containing the PNG data,or nil if there was a problem generating the data. This function may return nil if the image has no data or if the underlying CGImageRef contains data in an unsupported bitmap format.    var png: Data? { return UIImagePNGRepresentation(self) }    /// Returns the data for the specifIEd image in JPEG format.    /// If the image object’s underlying image data has been purged,calling this function forces that data to be reloaded into memory.    /// - returns: A data object containing the JPEG data,or nil if there was a problem generating the data. This function may return nil if the image has no data or if the underlying CGImageRef contains data in an unsupported bitmap format.    func jpeg(_ quality: JPEGQuality) -> Data? {        return UIImageJPEGRepresentation(self,quality.rawValue)    }}

用法：

if let imageData = image.jpeg(.lowest) {    print(imageData.count)}

Swift 2.3

extension UIImage {    var uncompressedPNGData: NSData?      { return UIImagePNGRepresentation(self)        }    var highestQualityJPEGNSData: NSData? { return UIImageJPEGRepresentation(self,1.0)  }    var highQualityJPEGNSData: NSData?    { return UIImageJPEGRepresentation(self,0.75) }    var mediumQualityJPEGNSData: NSData?  { return UIImageJPEGRepresentation(self,0.5)  }    var lowQualityJPEGNSData: NSData?     { return UIImageJPEGRepresentation(self,0.25) }    var lowestQualityJPEGNSData:NSData?   { return UIImageJPEGRepresentation(self,0.0)  }}

然后你可以这样使用它：

if let imageData = image.lowestQualityJPEGNSData {    print(imageData.length)}

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