Quartz 2D Drawing (Brush frame animation)

Source: Internet
Author: User

Custom view is written in the. m file

#import "KKView.h"@interfaceKkview ()/** The Y value of the picture*/@property (nonatomic, assign) cgfloat imgy;@end@implementationKkview- (void) awakefromnib{  //Create Cadisplaylink, default 60 times per second
Cadisplaylink *display = [Cadisplaylink displaylinkwithtarget:self selector: @selector (updataimage)]; //adding Cadisplaylink to the message loop[Display Addtorunloop:[nsrunloop mainrunloop] formode:nsdefaultrunloopmode]; }- (void) updataimage{//This will drop the DrawRect method .[self setneedsdisplay];}- (void) DrawRect: (cgrect) rect {cgcontextref CTX=Uigraphicsgetcurrentcontext (); Cgcontextclearrect (CTX, rect); Cgimageref img= [UIImage imagenamed:@"Snow"]. Cgimage; CGRect Imgrect; if(_imgy>rect.size.height) {_imgy=0; } _imgy+=1; IMGRECT.ORIGIN.Y=_imgy; Imgrect.origin.x=0; Imgrect.size= Cgsizemake ( -, -); Cgcontextdrawimage (CTX, Imgrect, IMG);}@end

Quartz 2D Drawing (Brush frame animation)

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.