如何解决Swift UIImage .jpegData 内存泄漏问题
我有一些代码可以接受 UIImage 并将该图像保存到磁盘。对多个图像迭代此代码。我注意到每次代码运行时,都会出现内存泄漏,直到视图被删除。
我将问题追踪到以下行:
var data = image.jpegData(compressionQuality: 0.8 )
每次调用此行时,都会为压缩图像分配相应数量的内存(每次约 10 Mb),并且在视图关闭之前不会释放。我什至试图删除任何数据的使用(即 refcount 应该是 0),但它仍然没有释放内存。
func save_to_folder( tray_number: Int64,tray_type: String,image: UIImage,filename: String ) -> Bool {
let dir = self.directory!
.appendingPathComponent( "trays" )
.appendingPathComponent( String( format: "tray_%04d",tray_number ) )
.appendingPathComponent( tray_type )
print( " save_dir: \( dir.path )" )
let full_filename = dir.appendingPathComponent( filename ).appendingPathExtension( "JPG" )
print( " full_filename: \( full_filename.path )" )
do {
try FileManager.default.createDirectory(at: dir,withIntermediateDirectories: true,attributes: nil )
}
catch let error {
print( "Error creating directory: \( error )" )
return false
}
var data = image.jpegData(compressionQuality: 0.8 )
/*
do {
try data!.write(to: full_filename,options: Data.WritingOptions.atomic )
return true
}
catch let error {
print( "Failed to write file: \( error )" )
}
data = nil
*/
return false
}
for itt in 0...self.URLs.count - 1{
let closure = { [weak self] in
print(self!.URLs[itt])
let image = UIImage.init(contentsOfFile: self!.URLs[itt].relativePath)
//temp_bore = try! Borehole(sqlite_filename:self!.borehole!.filename)
let _ = self?.borehole?.save_to_folder(tray_number: tray_number,tray_type: tray_type,image: image! )
tray_number += 1
progress += 1
dispatchQueue.main.async {
alertView.message = "Adding \( progress ) of \( total )"
}
}
closure()
}
有人知道这里发生了什么吗?为什么 jpegData 分配的内存永远不会释放?
解决方法
感谢 El Tomato,我找到了解决方案。
如果其他人遇到此问题,请在您的 .jpegData 调用周围添加 autoreleasepool
。
autoreleasepool{
let data = image.jpegData(compressionQuality: 0.8 )
do {
try data!.write(to: full_filename,options: Data.WritingOptions.atomic )
}
catch let error {
print( "Failed to write file: \( error )" )
}
}
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