注意
在iOS中访问相册,首先我们得获取用户授权,在iOS10之前不用再Info.plist写参数。
在iOS10 之后要自定义弹出的信息
Privacy - Photo Library Usage Description
Privacy - Camera Usage Description
获取权限
/// 获取权限
///
/// - Parameter accessBlock: 闭包回调
func accessCameraAuthority(accessBlock:AccessBlock!)
{
let authStatus = AVCaptureDevice.authorizationStatus(forMediaType: AVMediaTypeVideo)
if authStatus == AVAuthorizationStatus.notDetermined {
// 请求授权
AVCaptureDevice.requestAccess(forMediaType: AVMediaTypeAudio, completionHandler: { finish in
if finish {
if (accessBlock) != nil
{
accessBlock(true)
}
}
else
{
if (accessBlock) != nil
{
accessBlock(false)
}
}
})
}
else if authStatus == AVAuthorizationStatus.authorized
{
// 授权成功
if (accessBlock) != nil
{
accessBlock(true)
}
}
else
{
// 用户拒绝授权
if (accessBlock) != nil
{
accessBlock(false)
}
}
}
当返回true,我们就可以有访问权限了。
在iOS中截屏的方法如下:
/// 截屏
///
/// - Parameters:
/// - view: 要截屏的view
/// - Returns: 一个UIImage
func cutImageWithView(view:UIView) -> UIImage
{
// 参数①:截屏区域 参数②:是否透明 参数③:清晰度
UIGraphicsBeginImageContextWithOptions(view.frame.size, true, UIScreen.main.scale)
view.layer.render(in: UIGraphicsGetCurrentContext()!)
let image:UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext();
return image;
}
这个方法是获取当前view的内容,size的大小要巧妙的设置,比如你的view超出了看到的屏幕,你使用截图下来,
就是一部分回事黑色的区域。你截取当前能看到的,就widow就可以了。
我们在使用很多APP的时候会截出很长的图,这个时候我们就用巧取得方式来获取,方法如下:
/// 截屏
///
/// - Parameters:
/// - view: 要截屏的view
/// - Returns: 一个UIImage
func cutFullImageWithView(scrollView:UIScrollView) -> UIImage
{
// 记录当前的scrollView的偏移量和坐标
let currentContentOffSet:CGPoint = scrollView.contentOffset
let currentFrame:CGRect = scrollView.frame;
// 设置为zero和相应的坐标
scrollView.contentOffset = CGPoint.zero
scrollView.frame = CGRect.init(x: 0, y: 0, width: scrollView.frame.size.width, height: scrollView.frame.size.height)
// 参数①:截屏区域 参数②:是否透明 参数③:清晰度
UIGraphicsBeginImageContextWithOptions(scrollView.contentSize, true, UIScreen.main.scale)
scrollView.layer.render(in: UIGraphicsGetCurrentContext()!)
let image:UIImage = UIGraphicsGetImageFromCurrentImageContext()!
// 重新设置原来的参数
scrollView.contentOffset = currentContentOffSet
scrollView.frame = currentFrame
UIGraphicsEndImageContext();
return image;
}
这里是保证他是scrllView,来切换相应的offset和frame,来截取屏幕。有一点要注意,比如你的是tableView,下面的数据中的图片没有加载出来,也是肯定不会显示的。
接下来就是把截图保存到相册,下面是保存到系统相册:
func writeImageToAlbum(image:UIImage)
{
UIImageWriteToSavedPhotosAlbum(image, self, #selector(image(image:didFinishSavingWithError:contextInfo:)), nil)
}
func image(image: UIImage, didFinishSavingWithError error: NSError?, contextInfo:UnsafeRawPointer)
{
if let e = error as NSError?
{
print(e)
}
else
{
UIAlertController.init(title: nil,
message: "保存成功!",
preferredStyle: UIAlertControllerStyle.alert).show(self, sender: nil);
}
}
写入到指定的相册,这里看到的是先写入相册,再移动到指定的相册
// 看有没有指定的相册
let library = ALAssetsLibrary.init()
let albumGroups = NSMutableArray()
library.enumerateGroups(withTypes: ALAssetsGroupType(ALAssetsGroupAll), using:
{
oneGroup,pointer in
albumGroups.add(oneGroup! as ALAssetsGroup)
},
failureBlock:
{
error in
})
var haveCustomAlbum = false
for albumGroup in albumGroups
{
let groupName:String = (albumGroup as! ALAssetsGroup).value(forProperty: ALAssetsGroupPropertyName) as! String
print(groupName)
if groupName == "指定相册"
{
haveCustomAlbum = true
}
}
如果有指定相册直接写入没有就去创建
// 这里是创建相册
if !haveCustomAlbum
{
library.addAssetsGroupAlbum(withName: "指定相册",
resultBlock:
{alAsetGroup in
if alAsetGroup != nil
{
print("创建相册成功");
}
},
failureBlock:
{error in
print("创建相册失败");
})
}
下面是写入到指定的相册,下面的image,group和library都是上面获取到的
func writeImageToCustomAlbumFinish(image:UIImage,library:ALAssetsLibrary,alAsetGroup:ALAssetsGroup)
{
// 首先写入到写到相册 这里也可以用PHPhotoLibrary来做
library.writeImage(toSavedPhotosAlbum: image.cgImage, orientation:.up, completionBlock:
{ url,error in
if (error != nil)
{
// 取到asset
library.asset(for: url, resultBlock:
{
aAlAset in
if aAlAset != nil
{
// 添加到group
alAsetGroup.add(aAlAset)
}
},
failureBlock:
{
error in
})
}
})
}
拼图
func combinTwoImage(image1:UIImage,image2:UIImage) -> UIImage
{
let width = max(image1.size.width, image2.size.width)
let height = image1.size.height + image2.size.height
let offScreenSize = CGSize.init(width: width, height: height)
UIGraphicsBeginImageContext(offScreenSize);
let rect = CGRect.init(x:0, y:0, width:width, height:image1.size.height)
image1.draw(in: rect)
let rect2 = CGRect.init(x:0, y:image1.size.height, width:width, height:image2.size.height)
image1.draw(in: rect2)
let image:UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext();
return image;
}