step2: #import <QuartzCore/QuartzCore.h>
step3: use code
[[myView layer] setShadowOffset:CGSizeMake(5, 5)];
[[myView layer] setShadowRadius:6];
[[myView layer] setShadowOpacity:1];
[[myView layer] setShadowColor:[UIColor blueColor].CGColor];
2.添加圆
btn.layer.cornerRadius=8;
btn.layer.masksToBounds =YES;//使用边界来做遮罩

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