"iOS Dev-81" Setneedsdisplay refresh graphics and Cadisplaylink to simulate timer effects

(1) Effect

(2) Source code download (if prompted no small picture, you can find a replacement, see the effect on the line)

http://download.csdn.net/detail/wsb200514/8176339

(3) Summary:

--Because the DrawRect method calls only 1 times, if you need to refresh the drawing, you need to force the call to refresh with Setneedsdisplay.

--Learn the use of another "timer", the following two kinds of similar

-(void) awakefromnib{    cadisplaylink *link=[cadisplaylink displaylinkwithtarget:self selector: @selector ( Setneedsdisplay)];    [link addtorunloop:[nsrunloop mainrunloop] formode:nsdefaultrunloopmode];//    [Nstimer scheduledtimerwithtimeinterval:0.1 target:self selector: @selector (setneedsdisplay) Userinfo:nil Repeats:yes];}

"iOS Dev-81" Setneedsdisplay refresh graphics and Cadisplaylink to simulate timer effects