cocoa-touch

问题 I've already seen two similar questions to mine, but the answers for those questions do not work for me. I have an old project with a list of countries manually typed out inside a set of square brackets. I can easily use this in my pickerView but I'm wondering if there is a more efficient way to do this? I will be using the list of countries in a UIPickerView. 回答1: You can get a list of countries using the NSLocale class's isoCountryCodes which returns an array of [String] . From there, you

问题 I simply want to display the UIMenuController right after a textfield has become active. What i'm doing right now is: - (IBAction)textFieldeditingDidBegin:(UITextField *)sender { // textfield menu item UIMenuController *menu = [UIMenuController sharedMenuController]; [menu setTargetRect:sender.frame inView:self.view]; [menu setMenuVisible:YES animated:YES]; } The method gets called but it just will not display the menu... If i do a touch+hold gesture on the textfield it comes up regularly. I

问题 In my Core Data Model i've got an entity that has a date attribute and as the title suggests, i'd like to group this entity by (week)days. The problem is, the dates are stored more or less as timestamps and i don't know how to create a predicate that is capable of grouping/filtering my entities approprioately. I've figured out that i will probably have to do a fetch for each day, so created following method. The code were i need help with is right in the middle of it. -

问题 This question is extremely similar to UILabel with custom font displays *wrong* custom font, except I need to use three fonts from this family simultaneously. I am using Myriad Pro, just like that question, but I need to use Bold, Semibold, and Regular. Currently, when I try to use Bold via a macro defined as: #define MYRIAD_BOLD(x) [UIFont fontWithName:@"MyriadPro-Bold" size:(x)] ..it gives me Semibold. If I remove Semibold from the plist entries for "Fonts provided by application" (as is

问题 I'd like to do a series of string substitutions to removed xml-escaped chars such as '&' . 1) Is there an existing UIKit function that can do this? 2) If not, what's the best way to do it without leaking memory? Here's the idea: -(NSString*) unescape:(NSString*)string { string = [string stringByReplacingOccurrencesOfString:@"'" withString:@"'"]; string = [string stringByReplacingOccurrencesOfString:@"&" withString:@"&"]; string = [string stringByReplacingOccurrencesOfString:@"""

问题 I am looking for a class that will allow the user to draw?(the main purpose is to get their signature). I checked Cocoa Controls but couldn't find such a class. Just want to now if there's any before I start writing it myself. Thanks 回答1: Look at this tutorial: http://www.ifans.com/forums/showthread.php?t=132024 To get a JPG or PNG file, you can use the functions UIImageJPEGRepresentation or UIImagePNGRepresentation . They take a UIImage as input. And to get a UIImage from a UIView , you can

问题 Am I missing something about how NSDate dateByAddingTimeInterval works with days? Here is my code for subtracting 33 days from a specific date (AIDate). AIDate has a time value of 00:00 PST. activityOne.ActivityDateTime = [AIDate dateByAddingTimeInterval:-33*24*60*60]; If the AIDate equals 4-9-2013 00:00 PST, the above code will subtract 33 days and 1 hour which works out to 3-6-2013 23:00 PST. 回答1: 24*60*60 means 24 hours, and not 1 day. There is a huge difference between those two when your

问题 I have a UIPopoverController containing a UITableView . The popover is resized in its view controller's -viewDidAppear function to fit the contents of the table. While the popover resizes properly, its arrow is usually no longer pointing at the original CGRect . Is there a way to force the popover to reposition itself after a resize so that its arrow is pointing at its intended target? EDIT: I can't set the size of the popover in -viewDidLoad since the table view does not load its data until

问题 I'm looking for an easy way for users to download content from an iPhone to their computer. I've seen other apps that actually turn the iPhone into a server and give the user an IP address to navigate to on their computer. I've glanced at some Apple samples, but nothing looked too much like what I was going for. So what's the easiest way to make a server that listens on TCP port 80 (even better, an HTTP server) and sends responses? Hopefully using Objective C classes, but I can make a wrapper

问题 I'm working on an app where I need to send a good amount of notifications to the user daily. Around 5-40 depending on the user. I'm using local notifications to send it, but I know there is a 64 notification limit. Does this mean 64 notifications per day, or in total? 回答1: It means simultaneously scheduled for future delivery. You can send as many as you want per day, provided they don't overlap. If you add more than 64 requests (under UserNotifications ) or scheduled (under UIApplication /