iOS图片缓存和高斯模糊
private var bgImageGaussDataDict:[Int:Data] = [:]
var guassImageData = bgImageGaussDataDict[gauss]
if guassImageData == nil {
let image = bgImageOrigin?.sd_blurredImage(withRadius: CGFloat(gauss))
// 缓存经过压缩的jpeg data而不是UIImage,内存占用非常小
guassImageData = image?.jpeg(.low)
bgImageGaussDataDict[gauss] = guassImageData
}
if let data = guassImageData {
self.bgImageV.image = UIImage(data: data)
}
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 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(_ jpegQuality: JPEGQuality) -> Data? {
return jpegData(compressionQuality: jpegQuality.rawValue)
}
分类:
iOS
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