ios - Fade in a background view during custom animation transition -


i wanted add custom transition app , followed amazing answer found here.

it working great, wanted take step further. want have view on first page alpha 0 or hidden @ first fades in user swipes down between 2 pages. top view have transparent background appear though coming in background color. great example of mean can seen in snapchat, when swiping between pages seen in screen shot below. enter image description here

the background becomes blue , when new view comes in solid blue.

i understand code has go in presentation controller stated in original question answer followed, unsure how implement this. also, when setting shouldremovepresentersview false crash here 

func animatetransition(using transitioncontext:      uiviewcontrollercontexttransitioning) {         let inview   = transitioncontext.containerview         let toview   = transitioncontext.view(forkey: .to)!         let fromview = transitioncontext.view(forkey: .from)! }

i similar in app show image when gesture completed. fade image out in application, modified fade in minor change. in situation fade in or out image. using extension below, animatewithduration examples below might you. see code below:

    public extension uiimage {     func showandfadeout(atpoint point: cgpoint, sender:uiviewcontroller) {         let buttonview = uiimageview(image: self)         buttonview.center = point         sender.view.addsubview(buttonview)          uiview.animate(withduration: 3.0, delay: 0.0, options: .curveeaseout, animations: {             buttonview.alpha = 0          }, completion:  { finished in             buttonview.removefromsuperview()         })     }      func showandfadein(atpoint point: cgpoint, sender:uiviewcontroller) {         let buttonview = uiimageview(image: self)         buttonview.center = point         sender.view.addsubview(buttonview)         buttonview.alpha = 0          uiview.animate(withduration: 3.0, delay: 0.0, options: .curveeasein, animations: {             buttonview.alpha = 1         }, completion:  { finished in             buttonview.removefromsuperview()         })     } }

you can use this:

image.showandfadein(atpoint: gestureendpoint, sender: self)

hopefully that's helpful. remove button in completion block if want view stay on screen, remove line of code.


Comments

Post a Comment

Popular posts from this blog

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m
Read more

javascript - Z-index in d3.js -

i have map , when hover effect on region of map below yellow line , circle, last ones disappear. how can solve problem? http://jsfiddle.net/ot21n9qx/ var arc = g.append("path") .style("fill", "none") .style("stroke", "yellow") .style("stroke-width", 2) .attr("d", "m" + pathorigin[0] + "," + pathorigin[1] + " q" + svgpoint[0] + "," + pathorigin[1] + " " + svgpoint[0] + "," + svgpoint[1]); var circlesize = d3.scale.linear() .domain([0, 0.5, 1]) .range([4, 10, 4]); svg not have z order draws objects in order created. need create path , circle after create highlight regions. here forked fiddle: http://jsfiddle.net/o00fzgaf/1/
Read more