iphone-sdk-3.0

问题 I need to change color on the default "self.navigationItem.backBarButtonItem". To accomplish this I´ve created an custom Button class and implemented it like this: - (void)viewDidLoad { [super viewDidLoad]; BackButton *blueSaveButton = [[BackButton alloc] init]; UIBarButtonItem *temporaryBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:blueSaveButton]; temporaryBarButtonItem.title = @"Tillbaka"; self.navigationItem.backBarButtonItem = temporaryBarButtonItem; [temporaryBarButtonItem

问题 My biggest headache now is find a iPhone 3Gs with iOS 3.1.2 on it. iPhone 3Gs is everywhere, but all of them are with iOS 4.1 or even higher. My question is, is it possible that I get a iPhone 3Gs (with iOS 4.x) and some software package so that I can restore it back to iOS 3.1.2? Btw by saying 3.1.2 I mean the official non-jailbreaking 3.1.2. Many thanks, Di 回答1: You would have to have your SHSH's saved with Cydia, then you can downgrade to any version you like (that's supported). With that

问题 How do I get arctan MATH function in iphone SDK? 回答1: The function you are looking for is atan(double) 回答2: Use the "2nd"-function under the "("-key, top left with the iphone in horizontal position. The tan key will change to tan-1, i.e. arctan. 来源： https://stackoverflow.com/questions/5339595/how-do-i-get-arctan-math-function-in-ios

问题 I'm using MapKit on iPhone. How can I know when the user changes the zoom level (zoom in\out the map)? I've tried to use mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated; but that's called even when the map is only dragged. Unfortunately, when the map is dragged the mapView.region.span changes as well... Help? 10x 回答1: It is pretty simple to calculate the zoom level. See the snippet below. You can get the mRect parameter from the visibleMapRect property on your MKMapView

问题 I'd like an image to take up all of a navigation bar. This is the navigation that comes with a navigation based app. It appears on the RootViewController with the accompanying UITableView. I've seen some examples of how this might work. Set navigation bar title: UIImage *image = [UIImage imageNamed:@"TableviewCellLightBlue.png"]; UIImageView *imageView = [[UIImageView alloc] initWithImage:image]; [self.navigationController.navigationBar.topItem setTitleView:imageView]; The problem there is it

问题 I am taking screenshot image from currentview.but i want to set frame….don't want to convert fullview as image.I gave frame size..but it takes always Image as fullview..any help please? CGRect rectt = CGRectMake(100, 150,150,200); UIGraphicsBeginImageContext(rectt.size); [self.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); UIImageView *imgView = [[UIImageView alloc] initWithFrame:rectt]; 回答1:

问题 Has anyone seen an implementation of an "accordion" (maybe called "animated outline") view for the iPhone? I found an example project for Cocoa, but before trying a port, I was hoping that someone has invented the wheel already. To make it clear, in a UIView, consider a stack of sections, each containing a header, and then some contents. When the user touches the header (or through some message/event), if the section is already open => close it; if the section is closed => open it and close

问题 After surfing through tons of documentation on the web it seems that the iPhone always shoots the video at a 480x360 aspect ratio and applies a transformation matrix on the video track. (480x360 may change but its always the same for a given device) Here is a way of modifying the ffmpeg source within a iOS project and accessing the matrix http://www.seqoy.com/correct-orientation-for-iphone-recorded-movies-with-ffmpeg/ Here is a cleaner way of finding the transformation matrix in iOS-4 How to

问题 I can find the UIKit header files but i'd like to see how some of the UIKit classes are being implemented because i'm trying to create some custom controls. So basically i'm trying to find the UIKit .m files, where would they be located on my mac? 回答1: They aren't on your Mac (in source form). Only Apple has access to most UIKit source. What you have on your Mac is already compiled into library binary files. 回答2: The source code (as hotpaw2 said) is only available to Apple, but there are

问题 I can find the UIKit header files but i'd like to see how some of the UIKit classes are being implemented because i'm trying to create some custom controls. So basically i'm trying to find the UIKit .m files, where would they be located on my mac? 回答1: They aren't on your Mac (in source form). Only Apple has access to most UIKit source. What you have on your Mac is already compiled into library binary files. 回答2: The source code (as hotpaw2 said) is only available to Apple, but there are