uikit

问题 I deleted UIKit.framework and Foundation.framework in an xcode project by accident. I can't find the framework in the target information (general tab) link libraries section. How could I add them to the project again as I'm now getting many errors! 回答1: Project > Edit Active Target > General tab, click the + button to add frameworks. 来源： https://stackoverflow.com/questions/1462123/how-to-i-restore-deleted-uikit-framework-and-foundation-framework-and-others

问题 My whole app uses touchesMoved for drawing (Coregraphics). Should I be calling [self setNeedsDisplay] from within touchesMoved instead of performing the drawing code in there? Would that stop some lag that I am experiencing? The only reason I didn't try this before posting is because it is going to take me a few hours to convert all drawing to within drawRect and I wanted to know if it would be more would efficient than drawing in touchesMoved ? 回答1: Yes. You should always keep your drawing

问题 So using this link: How do I draw a shadow under a UIView? And this link: http://iphonedevelopment.blogspot.com/2008/11/creating-transparent-uiviews-rounded.html I came upon this implementation: - (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSaveGState(context); CGContextSetShadow(context, CGSizeMake(-15.0f, 20.0f), 5.0f); CGContextSetLineWidth(context, strokeWidth); CGContextSetStrokeColorWithColor(context, self.strokeColor.CGColor);

问题 i.e. %@ for strings, %f for doubles... I don't know the word for these placeholders but it would be great to have list for how to print booleans and other values. 回答1: Since NSLog takes a NSString as its argument, it uses the NSString format specifiers. This is virtually identical to the common printf specifiers. Also, the %@ specifier is not limited to NSString objects, but is for any Objective-C objects. The base NSObject class provides a generic description of the object consisting of its

问题 This is what I'm trying to do... I have one view controller that needs to dynamically display different subviews based on the presence of some data. Here is a simple mockup. Each colored block represents a unique subview . Sometimes the green block needs to be at the top, sometimes the green block won't display at all, sometimes the light blue block will be something different, etc. Each subview has interactive elements, so I've been creating and adding them like so: Defining a new view

问题 In iOS7, I set the keyboard for my UITextField in Interface builder to the dark style, however, whenever I click on the textField the keyboard initially shows as light for a fraction of a second before turning to the dark style, how can I have it not do this? 回答1: I had the same issue. It seems as though it only happens the first time the keyboard appears after an app has been suspended, and then resumed. I was never able to directly resolve the issue, but in my case, I was able to find a

问题 In iOS7, I set the keyboard for my UITextField in Interface builder to the dark style, however, whenever I click on the textField the keyboard initially shows as light for a fraction of a second before turning to the dark style, how can I have it not do this? 回答1: I had the same issue. It seems as though it only happens the first time the keyboard appears after an app has been suspended, and then resumed. I was never able to directly resolve the issue, but in my case, I was able to find a

问题 Just got this error in our error logging system, been searching hi and low and can't seem to find any solution. Any help is appreciated. Here is the stacktrace. 回答1: May be in your XCODE log you might have encountered this message "Presenting view controllers on detached view controllers is discouraged ". If yes then then try [self.view.window.rootViewController presentViewController:myVC]; if this fails then make sure you call presentViewController:myVC on immediate presenting ViewController

问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 7 years ago . I am trying to capture an image of a UIView with renderInContex , but it does not fully capture all of the subviews. (For example, it doesn't capture the

问题 I want to style a UITableView to look a lot like if it had the style UITableViewStyleGrouped but with some subtle differences (like different colors and rounded corners with a shorter radius). The rows have variable height. I want to use this custom style for most table view controllers in my app. See the Twitter, Groupon, & GitHub Issues apps for examples. How should I do this? I'm thinking of doing like UITableViewStyleGrouped does. UITableViewStyleGrouped sets backgroundView &