UIImageView 的圓角

imageThumbnail.image=[UIImage imageWithContentsOfFile:strPath]; 

imageThumbnail.layer.masksToBounds=YES; 

imageThumbnail.layer.cornerRadius=10.0; 

imageThumbnail.layer.borderWidth=1.0; 

imageThumbnail.layer.borderColor=[[UIColor grayColor] CGColor];

記得要 import <QuartzCore/QuartzCore.h>