获取屏幕尺寸
?CGRect rect=[[UIScreen mainScreen] bounds]; ?//全屏的
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获取当前剪切区尺寸
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CGContextRef?idevice；
CGRect boudsc=CGContextGetClipBoundingBox(idevice);
int cleft = boudsc.origin.x;
int ctop = boudsc.origin.y;
int cwidth = boudsc.size.width;
int cheight = boudsc.size.height;
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