cocoa-touch

问题 I have an object called masterMessages filled with objects called messages. Each message object has five keys: objectId senderId senderName messageBody timestamp Basically what I am doing now is querying all the messages sent to my user in this object called masterMessages. Then i'm using: self.senderIds = [masterMessages valueForKeyPath:@"@distinctUnionOfObjects.senderId"]; to get all the different sender ids (senderId) in an array called senderIds. With this I will populate my conversations

问题 I have an object called masterMessages filled with objects called messages. Each message object has five keys: objectId senderId senderName messageBody timestamp Basically what I am doing now is querying all the messages sent to my user in this object called masterMessages. Then i'm using: self.senderIds = [masterMessages valueForKeyPath:@"@distinctUnionOfObjects.senderId"]; to get all the different sender ids (senderId) in an array called senderIds. With this I will populate my conversations

问题 I want to add an image in between videos, just like smiley or clip art. Smiley and Clip art most probably has animation. I referred to Find assets in library - add to a AVMutableComposition - export = crash and also Apple's ALAssetLibrary . but could not get any ideas to complete my requirement. Is there any functionality to add UIImage s and CGImageRef s to an AVMutableComposition ? How can I add an image into a video? 回答1: it has been done with CALayer. If anyone wants to add UIImage in

问题 Can we add image together with text in a picker view? Anyone please help! 回答1: In picker view's delegate there is - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view method, where you can create your custom view (may be UIView with UILabel and UIImageView in your case) and return it - so UIPickerView will use it for row representation. See reference for more information. If you return UIView* in this method

问题 I'm trying to create a custom UIView that will, when tapped, segue to a new view controller. I'd like to do this programmatically rather than in Interface Builder. How do I get a reference to the destination view controller when I'm doing this? I assume I don't just create one and set it as the next view or something, so where does the reference come from? Since when it's done in the storyboard you simply choose where you want the segue to have as the destination, it's not an issue there,

问题 I want to create expandable table view. I found one link which is same as I want. But I want to create my own table view (Dont want to implements this github code). How do I achieve this type of functionality ? 回答1: See this nice tutorial: Table View Animations and Gestures Demonstrates how you can use animated updates to open and close sections of a table view for viewing, where each section represents a play, and each row contains a quotation from the play. It also uses gesture recognizers

问题 I want to create expandable table view. I found one link which is same as I want. But I want to create my own table view (Dont want to implements this github code). How do I achieve this type of functionality ? 回答1: See this nice tutorial: Table View Animations and Gestures Demonstrates how you can use animated updates to open and close sections of a table view for viewing, where each section represents a play, and each row contains a quotation from the play. It also uses gesture recognizers

问题 I have an iPad application in which I need to send a server a PDF file, alongside two POST variables, a user ID and a job ID. I am using the code below to do this: NSData *pdfData = [NSData dataWithContentsOfFile:currentPDFFileName]; NSData *validPDF = [[NSString stringWithString:@"%PDF"] dataUsingEncoding: NSASCIIStringEncoding]; if (!(pdfData && [[pdfData subdataWithRange:NSMakeRange(0, 4)] isEqualToData:validPDF])) { NSLog (@"Not valid"); } NSLog (@"%@", currentPDFFileName); NSLog (@"%@",

问题 I'm creating an iOS 8 extension(Action extension in specific), I have some user interfaces that are both used in extension and my container app, so that I want to put those view controllers with their xibs inside my Cocoa Touch Library, so that I can share them between my app and extension. But to my surprise, those xibs are neither in container app's bundle nor are they in my extension's bundle, so that neither of my app or extension can read those xibs. What should I do to achieve this? 回答1

问题 I'm calling the following code from drawRect - (void) drawPartial:(UIImage *)img colour:(UIColor *)colour { CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSaveGState(context); CGContextTranslateCTM(context, 0.0, self.bounds.size.height); CGContextScaleCTM(context, 1.0, -1.0); CGContextDrawImage(context, self.frame, img.CGImage); if (colour!=nil) { CGContextSetBlendMode (context, kCGBlendModeColor ); CGContextClipToMask(context, self.bounds, img.CGImage); CGContextSetFillColor