将图片保存到沙盒下,首先获取沙盒路径,追加图片名称,将图片转换成NSData类型,写到文件里。
persent参数:图片质量参数,该值越大,表示图片越清晰,图片文件也就越大
//保存图片至沙盒
private func saveImage(currentImage: UIImage, persent: CGFloat, imageName: String){
if let imageData = UIImageJPEGRepresentation(currentImage, persent) as NSData? {
let fullPath = NSHomeDirectory().appending("/Documents/").appending(imageName)
imageData.write(toFile: fullPath, atomically: true)
print("fullPath=\(fullPath)")
}
}
也可以通过newSize自定义图片的大小
private func saveImage(currentImage: UIImage, newSize: CGSize, imageName: String){
//压缩图片尺寸
UIGraphicsBeginImageContext(newSize)
currentImage.draw(in: CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height))
if let newImage = UIGraphicsGetImageFromCurrentImageContext() {
//UIImageJPEGRepresentation此方法可将图片压缩,但是图片质量基本不变,第二个参数即图片质量参数。
if let imageData = UIImageJPEGRepresentation(newImage, 1) as NSData? {
let fullPath = NSHomeDirectory().appending("/Documents/").appending(imageName)
imageData.write(toFile: fullPath, atomically: true)
print("fullPath=\(fullPath)")
}
}
}
从文件中读取图片
if let savedImage = UIImage(contentsOfFile: fullPath) {
self.imageView.image = savedImage
} else {
print("文件不存在")
}
网友评论