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Document directory The world before multitasking Multitasking on Conclusion Address: http://www.drobnik.com/touch/2010/07/understanding-ios-4-backgrounding-and-delegate-messaging/ Update: added handleopenurl to the flow charts. Added uiapplicationexitsonsuspend. untangled some lines. Now that we all are moving our source code gradually to iOS

, cgfloat SX, CGFloat sy);At this time also the first parameter, less make, the direct verb. Then it is possible to change all the time, no longer relative to the position of the preliminary object.Cgaffinetransform cgaffinetransformrotate (Cgaffinetransform t, cgfloat angle);Similarly, rotate is a verb, remove make, then there must be more than one parameter, relative to the basis of a transform parameter to change.clears the previously set transform propertyView.transform = cgaffinetransformid

IOS multithreading implementation 4-NSOperation, ios4-nsoperation I. Introduction NSOperation is an abstract class. We can use the subclass provided by the system or implement its own subclass. It has the following features: A. GCD-Based Object-Oriented encapsulation in OC language; B. It is easier to use than GCD (Object-Oriented ); C. provides some functions that are not implemented well with GCD (http://

On the early morning of the 19th, Apple released the latest official version of ios6, xcode4.5, and 10.8.2. the upgrade was completed one day and one night with the company's network updated yesterday. It took several minutes to upgrade the original app perfectly, supporting 1136*640 resolution. Since the app was originally compatible with the iPhone/iPad, that is, the devices is set to universal, the upgrade process is very simple. 1. Update cont

. transparendvaluedelegate = b;//Set Object A proxy is object BThis allows the values to be passed between views A and B through a delegate!The following example delegate has two categories:1. The proxy object of a view class object is the parent view, and the child view uses the proxy implementation to have the parent view display a different child view;2. One child view under the same parent view is a proxy object for another child view, and another child view changes its background color to t

*tabbarbtn in Self. Subviews) {//2, if it's Uitabbarbutton, take it out and reset their position. if([Tabbarbtn iskindofclass:nsclassfromstring (@"Uitabbarbutton")] {btnx = i * BTNW; Tabbarbtn. Frame= CGRectMake (Btnx, Btny, BTNW, BTNH);//When it comes to the second time, add a location to cephalostachyum the position of the button. if(i==1) {i++; } i++; } }//Set the location of the Add button Self. AddButton. Center= Cgpointmake (W *0.5, H *0.5);}@endIV: Supplem