設定元件為圓角的方法

使用相關的知識點是calayer， 對這些內容一知半解的。

開發中用到了，搜尋了很多網頁，也算是做個小總結。

一直接設定view的四個角為圓角。

#import view.layer.cornerradius = cornerradiusinpixels;

view.layer.maskstobounds = yes;

二 根據需要設定view的角，比如左上，左下，右上，右下

此方法來自:

static inline uiimage* mtdcontextcreateroundedmask( cgrect rect, cgfloat radius_tl, cgfloat radius_tr, cgfloat radius_bl, cgfloat radius_br ) 

// cerate mask
cgfloat minx = cgrectgetminx( rect ), midx = cgrectgetmidx( rect ), maxx = cgrectgetmaxx( rect );
cgfloat miny = cgrectgetminy( rect ), midy = cgrectgetmidy( rect ), maxy = cgrectgetmaxy( rect );
cgcontextbeginpath( context );
cgcontextsetgrayfillcolor( context, 1.0, 0.0 );
cgcontextaddrect( context, rect );
cgcontextclosepath( context );
cgcontextdrawpath( context, kcgpathfill );
cgcontextsetgrayfillcolor( context, 1.0, 1.0 );
cgcontextbeginpath( context );
cgcontextmovetopoint( context, minx, midy );
cgcontextaddarctopoint( context, minx, miny, midx, miny, radius_bl );
cgcontextaddarctopoint( context, maxx, miny, maxx, midy, radius_br );
cgcontextaddarctopoint( context, maxx, maxy, midx, maxy, radius_tr );
cgcontextaddarctopoint( context, minx, maxy, minx, midy, radius_tl );
cgcontextclosepath( context );
cgcontextdrawpath( context, kcgpathfill );
// create cgimageref of the main view bitmap content, and then
// release that bitmap context
cgimageref bitmapcontext = cgbitmapcontextcreateimage( context );
cgcontextrelease( context );
// convert the finished resized image to a uiimage 
uiimage *theimage = [uiimage imagewithcgimage:bitmapcontext];
// image is retained by the property setting above, so we can 
// release the original
cgimagerelease(bitmapcontext);
// return the image
return theimage;
}

然後使用上面的函式，在需要的view上進行設定

uiimage *mask = mtdcontextcreateroundedmask( self.view.bounds, 50.0, 50.0, 0.0, 0.0 );

// create a new layer that will work as a mask
calayer *layermask = [calayer layer];
layermask.frame = self.view.bounds;       
// put the mask image as content of the layer
layermask.contents = (id)mask.cgimage;       
// set the mask layer as mask of the view layer
self.view.layer.mask = layermask;              
// add a backaground color just to check if it works
self.view.backgroundcolor = [uicolor redcolor];
// add a test view to verify the correct mask clipping
uiview *testview = [[uiview alloc] initwithframe:cgrectmake( 0.0, 0.0, 50.0, 50.0 )];
testview.backgroundcolor = [uicolor bluecolor];
[self.view addsubview:testview];

但是如果uitableview設定兩個角為圓角，兩個角為方角的時候，2的方法就有錯誤出現。

現在只能是給uitableview在加乙個背景view,使用2進行設定，然後組合顯示。

其他參考

實現圓角的三種方法

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