iOS development-uiimageview efficiently set up radius

rounded settings are ubiquitous in iOS and are easy to develop, but sometimes if a page has a large number of images that need to be rounded, it is easy to create performance problems, Uiimageview ios9.0 before setting the fillet will produce off-screen rendering,after 9.0 will not produce off-screen rendering

So you need to add some changes to the way you want to set round corners on a daily basis:

1. The simplest picture fillet setting:

    Self.imageview=[[uiimageview Alloc]initwithframe:cgrectmake (100,200, N.)];    [Self.imageview setimage:[uiimage imagenamed:@ "flyelephant.jpg"];    self.imageview.layer.cornerradius=50;    Self.imageview.layer.maskstobounds=yes;    [Self.view AddSubview:self.imageView];

2. Set rasterize raster processing, will put the picture in the buffer, do not continue to do picture rendering:

    Self.imageview=[[uiimageview Alloc]initwithframe:cgrectmake (100,200, N.)];    [Self.imageview setimage:[uiimage imagenamed:@ "dress3.jpg"];    self.imageview.layer.cornerradius=50;    Self.imageView.layer.shouldRasterize = YES;    Self.imageview.clipstobounds=yes;    Self.imageview.layer.rasterizationscale=[uiscreen Mainscreen].scale;  Do not set will blur, do not believe you can try    [Self.view AddSubview:self.imageView];

3.UIBezierPath Bézier curve drawing (recommended)

    Self.imageview=[[uiimageview Alloc]initwithframe:cgrectmake (100,200, N.)];    UIImage *anotherimage = [UIImage imagenamed:@ "flyelephant.jpg"];    Note The third option is set    uigraphicsbeginimagecontextwithoptions (Self.imageView.bounds.size, NO, [UIScreen mainscreen]. scale);    Crop a circle before drawing    [[Uibezierpath bezierPathWithRoundedRect:self.imageView.bounds                                cornerradius:50] Addclip] ;    The picture is drawn inside the set circle    [Anotherimage drawInRect:self.imageView.bounds];    Get picture    self.imageView.image = Uigraphicsgetimagefromcurrentimagecontext ();    Finish Drawing    uigraphicsendimagecontext ();    [Self.view AddSubview:self.imageView];

Reference: Http://stackoverflow.com/questions/11049016/cliptobounds-and-maskstobounds-performance-issue

Http://stackoverflow.com/questions/17593524/using-cornerradius-on-a-uiimageview-in-a-uitableviewcell

iOS development-uiimageview efficiently set up radius