cocoa-touch

问题 I have a php webpage that requires a login (userid & password). I have the user enter the information into the app just fine.. but I need an example on how to do a POST request to a website. The apple example on the support site is rather complicated showing a picture upload.. mine should be simpler.. I just want to post 2 lines of text.. Anyone have any good examples? Alex 回答1: This is what I recently used, and it worked fine for me: NSString *post = @"key1=val1&key2=val2"; NSData *postData

问题 Is there a way to make a UIScrollView auto-adjust to the height (or width) of the content it's scrolling? Something like: [scrollView setContentSize:(CGSizeMake(320, content.height))]; 回答1: The best method I've ever come across to update the content size of a UIScrollView based on its contained subviews: Objective-C CGRect contentRect = CGRectZero; for (UIView *view in self.scrollView.subviews) { contentRect = CGRectUnion(contentRect, view.frame); } self.scrollView.contentSize = contentRect

问题 I'm reading Erica Sadun's iPhone Developer's Cookbook , and ran into a question. She says in the book that the way to find the user's Documents directory is with the code: [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; but that seems slightly brittle, and dissimiliar to the normal Mac way of doing it, which would be: NSSearchPathForDirectoriesInDomains(NSDocumentsDirectory, NSUserDomainMask, YES); Are there any particular reasons to use one over the other? 回答1: Objc: NSArray

问题 I'm having trouble with my code. I'm trying to move the UIScrollView when I'm editing an UITextField that should be hidden by the keyboard pop. I'm moving the main frame right now because I don't know how to 'scroll up' in the code. So, I did a little bit of code, it's working fine but when I edit an UItextfield and I switch to another UITextField without pressing on the 'return' button the main view goes waaayyyyy to far up. I did an NSLog() with my variables size, distance and textFieldRect

问题 I have UITextView with some text in it. Everything was fine with iOS 6 but now with iOS 7 it leaves the blank space on top and then place the text below the middle of the textview. I didn't set any contentOffSet. Please Help! 回答1: A text view is a scroll view. View controllers will add a content offset automatically to scroll views, as it is assumed they will want to scroll up behind the nav bar and status bar. To prevent this, set the following property on the view controller containing the

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 8 years ago . As a beginner, I'm struggling with iCloud. There are some samples, but they are usually quite detailed (on the developer forum there

问题 Is it possible to have a red UIBarButtonItem? 回答1: If anyone is looking for code to exactly duplicate a simple UIBarButtonItem: UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; [button setBackgroundImage:[UIImage imageNamed:@"delete.png"] forState:UIControlStateNormal]; [button setTitle:@"Delete" forState:UIControlStateNormal]; button.titleLabel.font = [UIFont fontWithName:@"Helvetica-Bold" size:12.0f]; [button.layer setCornerRadius:4.0f]; [button.layer setMasksToBounds:YES];

问题 For some crazy reason I can't find a way to get a list of files with a glob for a given directory. I'm currently stuck with something along the lines of: NSString *bundleRoot = [[NSBundle mainBundle] bundlePath]; NSArray *dirContents = [[NSFileManager defaultManager] directoryContentsAtPath:bundleRoot]; ..and then stripping out the stuff I don't want, which sucks. But what I'd really like is to be able to search for something like "foo*.jpg" instead of asking for the entire directory, but I

问题 I am using MKMapView and have added a number of annotation pins to the map about a 5-10 kilometre area. When I run the application my map starts zoomed out to show the whole world, what is the best way to zoom the map so the pins fit the view? EDIT: My initial thinking would be to use MKCoordinateRegionMake and calculate the coordinate centre, longitudeDelta and latitudeDelta from my annotations. I am pretty sure this will work, but I just wanted to check I was not missing anything obvious.

问题 I have a UIWebView with different (single page) content. I'd like to find out the CGSize of the content to resize my parent views appropriately. The obvious -sizeThatFits: unfortunately just returns the current frame size of the webView. 回答1: It turned out that my first guess using -sizeThatFits: was not completely wrong. It seems to work, but only if the frame of the webView is set to a minimal size prior to sending -sizeThatFits: . After that we can correct the wrong frame size by the