如何在視網膜顯示質量不變的情況下捕捉UIView到UI圖像我的代碼適用于正常設備，但在視網膜設備上創建模糊圖像。有人知道解決我的問題嗎？+ (UIImage *) imageWithView:(UIView *)view{
UIGraphicsBeginImageContext(view.bounds.size);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage * img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;}
3 回答
慕容森
TA貢獻1853條經驗 獲得超18個贊
UIGraphicsBeginImageContextUIGraphicsBeginImageContextWithOptions
UIGraphicsBeginImageContext
#import <QuartzCore/QuartzCore.h>+ (UIImage *)imageWithView:(UIView *)view{
UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage * img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;}func image(with view: UIView) -> UIImage? {
UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.isOpaque, 0.0)
defer { UIGraphicsEndImageContext() }
if let context = UIGraphicsGetCurrentContext() {
view.layer.render(in: context)
let image = UIGraphicsGetImageFromCurrentImageContext()
return image }
return nil}
至尊寶的傳說
TA貢獻1789條經驗 獲得超10個贊
extension UIImage {
class func imageWithView(view: UIView) -> UIImage {
UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0)
view.drawViewHierarchyInRect(view.bounds, afterScreenUpdates: true)
let img = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return img }}編輯：SWIFT 4改進版
extension UIImage {
class func imageWithView(_ view: UIView) -> UIImage {
UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.isOpaque, 0)
defer { UIGraphicsEndImageContext() }
view.drawHierarchy(in: view.bounds, afterScreenUpdates: true)
return UIGraphicsGetImageFromCurrentImageContext() ?? UIImage()
}}let view = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100)) let image = UIImage.imageWithView(view)
添加回答
舉報
0/150
提交
取消