cgcontext

问题 I have an IOS application that needs to update a view in response to either user or external events. The drawing time can be either very short or very long (several seconds) depending upon what is in the view. Right now, the drawing takes place in the drawRect method for the view When the drawing is long and there is a lot of user interaction the app becomes unresponsive. When it needs updating, the entire view needs to be updated. If a change comes in the middle of drawing, it would make

问题 PROBLEM : After I take screenshot the image is blurry when check by zooming. The text inside image seems to be blurred when zoomed. I know this question have been raised many a times but none of them have desired solution. I already checked quite a few post like this one All the solution been shared so far on this forum are repeated or same in any other way but none of them has a solution for the problem. Here is what I am doing: extension UIView { func asImage() -> UIImage? { let format =

问题 PROBLEM : After I take screenshot the image is blurry when check by zooming. The text inside image seems to be blurred when zoomed. I know this question have been raised many a times but none of them have desired solution. I already checked quite a few post like this one All the solution been shared so far on this forum are repeated or same in any other way but none of them has a solution for the problem. Here is what I am doing: extension UIView { func asImage() -> UIImage? { let format =

问题 PROBLEM : After I take screenshot the image is blurry when check by zooming. The text inside image seems to be blurred when zoomed. I know this question have been raised many a times but none of them have desired solution. I already checked quite a few post like this one All the solution been shared so far on this forum are repeated or same in any other way but none of them has a solution for the problem. Here is what I am doing: extension UIView { func asImage() -> UIImage? { let format =

来源： https://stackoverflow.com/questions/15008270/get-alpha-channel-from-uiimage-rectangle

来源： https://stackoverflow.com/questions/15008270/get-alpha-channel-from-uiimage-rectangle

来源： https://stackoverflow.com/questions/15008270/get-alpha-channel-from-uiimage-rectangle

来源： https://stackoverflow.com/questions/15008270/get-alpha-channel-from-uiimage-rectangle

来源： https://stackoverflow.com/questions/15008270/get-alpha-channel-from-uiimage-rectangle

来源： https://stackoverflow.com/questions/15008270/get-alpha-channel-from-uiimage-rectangle