lanjin_的专栏

CGContextRef context = UIGraphicsGetCurrentContext(); 设置上下文   CGContextMoveToPoint 开始画线   CGContextAddLineToPoint 画直线     CGContextAddEllipseInRect 画一椭圆   CGContextSetLineCap 设置线条终点形状   CGContextSetLi

(一)[UIView beginAnimations:nilcontext:nil];[UIView setAnimationDuration:0.75];     //设置动画时间[UIView setAnimationTransition:UIViewAnimationTransitionCurlUp              forView:self.viewcache:

图片绘制：将图片直接绘制倒view上UIImage* image = [UIImage imageNamed:@"5.png"];[image drawAtPoint:CGPointMake(100, 100)];//---------------------------------------------------------------------------------

Graphics States 在创建context的时候，都会创建一个空的stack用于存储graphics的状态。通过函数CGContextSaveGState和函数CGContextRestoreGState分别将graphics的状态压入和弹出stack。  graphics的状态不好看path，path数据不会存在stack中。Drawing to a View

//遍历图片像素，更改图片颜色void ProviderReleaseData (void *info, const void *data, size_t size){    free((void*)data);}- (UIImage*) imageBlackToTransparent:(UIImage*) image{    /