iOS development--actual Combat Technology OC & click the status bar ScrollView (including child controls) to automatically roll to the top

Last Update:2015-08-16 Source: Internet

Author: User

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Click the status bar ScrollView (including child controls) to automatically roll to the topIn fact, this way we usually see more, and suitable for the needs of users, so moved to ponder a bit, the effect is goodHere is the solution to the idea of one by one write out to not fragment the code to show, in the code I added a detailed comment objective-c routines and Swift basically, in the end will be the swift and Objective-c code together, If you need to directly solve the problem of children's shoes can directly copy the code into the project can <ul class=" list-paddingleft-2"> <ul class=" list-paddingleft-2"> <li>First create a topwindow inherit to nsobject, here we consider the function is completely encapsulated, so all methods are used by the class method, so with the most basic class can be</li> <li>Initialize the Topwindow in the Initialize method, change the Topwindow level to the highest Uiwindowlevelalert level, set the Topwindow position, and add a click gesture</li> <li>In the method Topwindow is clicked on, we take out the uiapplication keywindow, traverse all the Keywindow's child controls, and if the content is ScrollView and displayed in the current Keywindow condition, Restores the Y value of the Subview Contentoffset to the original</li> <li>The recursive routines then have child controls that meet the conditions when traversing the subview, and stop when no conditions are met</li> </ul> </ul>Swift's Code<pre>1 Import UIKit2 classTopwindow:uiwindow {3 Private StaticLet window_: UIWindow =UIWindow ()4 ///class initialization method to ensure that Window_ is created only once5 Override classFunc Initialize () {6Window_.frame = CGRectMake (0,0,Global. appwidth, -)7Window_.windowlevel =Uiwindowlevelalert8Window_.addgesturerecognizer (uitapgesturerecognizer (target:self, action:"Topwindowclick"))9 }Ten classfunc topwindowclick () { one //iterates through all view of the current main window, rolling back the ScrollView that meet the condition aSearchallowscrollviewinview (uiapplication.sharedapplication (). keywindow!) - } - Private classfunc searchallowscrollviewinview (superview:uiview) { the forSubview:uiviewinchSuperview.subviews as![UIView] { - ifSubview.iskindofclass (uiscrollview.self) &&Superview.viewisinkeywindow () { - //Get Scrollview's contentoffset. -var offest = (subview as!uiscrollview). Contentoffset + //restores the y-axis of the offest to the first value -Offest.y =-(subview as!uiscrollview). contentinset.top + //Reset the contents of ScrollView a(subview as! uiscrollview). Setcontentoffset (offest, animated:true) at } - //recursive, Let the child control call this method again to determine when there is a condition that satisfies the view - Searchallowscrollviewinview (subview) - } - } - ///add Topwindow to make gestures effective in classfunc Showtopwindow () { -Window_.hidden =false to } + ///Hide topwindow, Remove gestures - classfunc Hiddentopwindow () { theWindow_.hidden =true * } $ }Panax Notoginseng ///an extension of the UIView - extension UIView { the ///determines whether the view of the calling method is in Keywindow +Func Viewisinkeywindow ()Bool { aLet Keywindow = uiapplication.sharedapplication (). keywindow! the //converts the coordinate system of the current view to Window.bounds +Let Viewnewframe =keywindow.convertrect (self.frame, fromView:self.superview) -Let Keywindowbounds =Keywindow.bounds $ //determine if the current view is within the range of Keywindow $Let isintersects =cgrectintersectsrect (viewnewframe, Keywindowbounds) - //determine if all conditions are met - return!self.hidden && Self.alpha >0.01&& Self.window = = Keywindow &&isintersects the } -}</pre><pre class="brush:js;toolbar:false"><pre class="brush:js;toolbar:false"> In appdelegate, when the program starts the completion method, it is OK to add it.</pre></pre><pre><pre>1 func application (application:uiapplication, didfinishlaunchingwithoptions launchoptions: [NSObject: Anyobject]?) - Bool {2 // Add Top window3 Topwindow.showtopwindow () 4 returntrue5 }</pre></pre>Note that after adding a custom window, the controller changes the status bar state method will be invalidated, you can change the status bar in the Info.plist management to UIApplication resolution, Either call Topwindow.hiddentopwindow () in the controller that needs to change the status bar, or change the info.plist directly, using Uiapplication.sharedapplication (). Setstatusbarstyle to manageObjective-c Code. h files expose only display and hide methods<pre><pre>1 @interface Wnxtopwindow:nsobject 2 + (void) show; 3 + (void) hide; 4 @end</pre></pre>. m file<pre>1 #import "WNXTopWindow.h"2 @implementationWnxtopwindow3 StaticUIWindow *window_;4 //Initialize window5+ (void) Initialize {6Window_ =[[uiwindow alloc] init];7Window_.frame = CGRectMake (0,0, [uiscreen mainscreen].bounds.size.width, -);8Window_.windowlevel =uiwindowlevelalert;9 [window_ addgesturerecognizer:[[uitapgesturerecognizer alloc] initwithtarget:self action: @selector (windowclick )]];Ten } one+ (void) Show { aWindow_.hidden =NO; - } -+ (void) Hide { theWindow_.hidden =YES; - } - //Listening window click -+ (void) Windowclick { +UIWindow *window =[uiapplication sharedapplication].keywindow; - [self searchscrollviewinview:window]; + } a+ (void) Searchscrollviewinview: (UIView *) Superview { at for(uiscrollview *subviewinchSuperview.subviews) { - //if It's scrollview, scroll to the top of the - if([subview Iskindofclass:[uiscrollviewclass]] &&[subview Isshowingonkeywindow]) { -Cgpoint offset =subview.contentoffset; -Offset.y =-subview.contentInset.top; - [subview setcontentoffset:offset animated:yes]; in } - //recursively continues to find child controls to [self searchscrollviewinview:subview]; + } - } the+ (BOOL) isshowingonkeywindow: (UIView *) View { * //main Window $UIWindow *keywindow =[uiapplication sharedapplication].keywindow;Panax Notoginseng //calculates the rectangle of self with the upper-left corner of the main window as the origin of the coordinates . -CGRect Newframe =[keywindow convertRect:view.frame fromView:view.superview]; theCGRect winbounds =keywindow.bounds; + //does the bounds of the main window overlap with the self's rectangular box ? aBOOL intersects =cgrectintersectsrect (newframe, winbounds); the return!view.ishidden && View.alpha >0.01&& View.window = = Keywindow &&intersects; + } - @end $ also , the Topwindow is displayed in the program initialization complete appdelegate file, and the whole project is Solved. $ --(BOOL) application: (uiapplication *) application didfinishlaunchingwithoptions: (nsdictionary *) launchoptions { - //Add a window and click on the window to roll the ScrollView to the top of the Screen. the [wnxtopwindow show]; - returnYES;Wuyi}</pre>iOS development--actual Combat Technology OC & click the status bar ScrollView (including child controls) to automatically roll to the top

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iOS development--actual Combat Technology OC & click the status bar ScrollView (including child controls) to automatically roll to the top

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