ios4

问题 In my application the user can add any number of images to the view. If he tries to add more images of bigger in memory size the application receives memory warning . So I want to display an alert to don't add images after receiving memory warning level = 2. Is it possible If so please help me. Thank You 回答1: For User Experience sake, don't display an alert . Handling memory is your responsibility and not that of your user. 回答2: What kind of alert do you want to dislplay? you could make an

问题 In my application the user can add any number of images to the view. If he tries to add more images of bigger in memory size the application receives memory warning . So I want to display an alert to don't add images after receiving memory warning level = 2. Is it possible If so please help me. Thank You 回答1: For User Experience sake, don't display an alert . Handling memory is your responsibility and not that of your user. 回答2: What kind of alert do you want to dislplay? you could make an

问题 I do not want any code but want to get reference that how can we find the angle between two locations defined by Latitude or Longitude... If you do have reference then Please help me to solve my problem... Thanx in advance.... 回答1: The formula to calculate bearing is: θ = atan2( sin(Δlong).cos(lat2), cos(lat1).sin(lat2) − sin(lat1).cos(lat2).cos(Δlong) ) Bearing is a direction to move from one location to another location (starting from north and then clockwise). While angle in 2D starts from

问题 A question was asked on SO about the iPhone 4 user agent and the iOS 5.0 user agent. I use the following to detect different mobile devices, viewport and screen. I'd like to be able to distinguish between the iPhone 5 and all other iOS devices. As far as I know, the line I'm using to detect the iOS 5.0 user agent var iPhone5 would also apply to any iOS device running iOS 5.0, so technically it's incorrect. var pixelRatio = window.devicePixelRatio || 1; var viewport = { width: window

问题 i have several table views in my app. I am familiar with the usual behaviour of tables, that when you select a row and progress to a pushed view, it turnes blue, then when you go back it stays blue for a split second then fades to white, in order to notify the user of what row was just selected. This worked perfectly up until recently when i noticed it no longer did the last bit of what I described: it didn't stay blue for that split second... I have no idea why, but after reading a few

问题 i have several table views in my app. I am familiar with the usual behaviour of tables, that when you select a row and progress to a pushed view, it turnes blue, then when you go back it stays blue for a split second then fades to white, in order to notify the user of what row was just selected. This worked perfectly up until recently when i noticed it no longer did the last bit of what I described: it didn't stay blue for that split second... I have no idea why, but after reading a few

问题 Is it possible to download a file while the app is in background in iPhone 4? 回答1: Under iOS 4.x, you can use request some background time using UIApplication beginBackgroundTaskWithExpirationHandler: and perhaps continue a file download for a limited period of time. See Apple's document on "multitasking" background execution for details. 回答2: Yes, it is. It's supported in ASIHTTPRequest as of v1.8: http://allseeing-i.com/ASIHTTPRequest/How-to-use#background_downloads_ios (There was also an

问题 In Steve Jobs' keynote announcement of the iPhone SDK 4 earlier this year, one of the slides showed that a "Half curl page transition" was part of the new SDK: alt text http://cl.ly/c203189b44788d490ae8/content I've looked through the iOS API docs and I can't seem to find this transition. Does anyone know where it is? 回答1: It's not a transition, but a modalTransitionStyle . You can check the docs here: http://developer.apple.com/iphone/library/documentation/uikit/reference/UIViewController

问题 In Steve Jobs' keynote announcement of the iPhone SDK 4 earlier this year, one of the slides showed that a "Half curl page transition" was part of the new SDK: alt text http://cl.ly/c203189b44788d490ae8/content I've looked through the iOS API docs and I can't seem to find this transition. Does anyone know where it is? 回答1: It's not a transition, but a modalTransitionStyle . You can check the docs here: http://developer.apple.com/iphone/library/documentation/uikit/reference/UIViewController

问题 I'm trying to test an app I'm developing on my iPhone. To do that I changed the target from Simulator to Device on Xcode. The application is correctly uploaded to the device and it works. The main view is shown but if I try to open a secondary view, the application crashes. On the iPhone log (I installed the iPhone configuration utility to see the console [is the only way to see the log from iPhone?]) I can see this error: Could not load NIB in bundle But, on the simulator it works fine. What