iOS Pulltorefresh using animated GIF or image array or Vector image

Tell me about those amazing pull-down effects.

1. Animation drop-down, here to borrow GitHub resources

Advantages: Directly with the GIF image processing, the drop-down progress in full accordance with the GIF graph running time, as long as the time and pull-down progress matching can be, the effect is smooth

Https://dribbble.com/shots/1418440-Twisted-gif?list=searches&tag=animated_gif&offset=3

There are a lot of GIF resources available for download reference

Project Address: Https://github.com/uzysjung/UzysAnimatedGifPullToRefresh

2. Vector image Processing

Project Reference Address: Https://github.com/nicolastinkl/TKRefereshTableHeaderView

Advantages: GPU rendering, the effect is conceivable. It is troublesome to adjust the vector diagram when using

3. The most common circle progress is filled with such effects

This is relatively simple. Can be achieved directly through Uiview-drawrect

//Only override Drawrect:if perform custom drawing.//An empty implementation adversely affects performance during animation.- (void) DrawRect: (cgrect) rect{//Drawing CodeCgcontextref context =Uigraphicsgetcurrentcontext (); Cgcontextsetlinewidth (Context,1.0);    Cgcontextsetlinecap (context, kcglinecapround); Cgcontextsetstrokecolorwithcolor (context, [Uicolor Redcolor].    Cgcolor); CGFloat startangle=-m_pi/3; CGFloat Step= One*m_pi/6*self.progress; Cgcontextaddarc (context, Self.bounds.size.width/2, self.bounds.size.height/2, self.bounds.size.width/2-3, StartAngle, Startangle+step,0); Cgcontextstrokepath (context);}

View Code

GitHub Address: https://github.com/phaibin/EGOTableViewPullRefresh/blob/master/Demo/TableViewPull/Classes/View/ refreshtableheaderview/circleview.m