http://bynomial.com/blog/?p=52
加边框:
label.layer.borderColor = [UIColor blueColor].CGColor;
label.layer.borderWidth = 1;
圆角:
label.layer.cornerRadius = 20;
label.layer.borderColor = [UIColor grayColor].CGColor;
label.layer.borderWidth = 3;
加阴影:
label.layer.shadowColor = [UIColor blackColor].CGColor;
label.layer.shadowOpacity = 1.0;
label.layer.shadowRadius = 5.0;
label.layer.shadowOffset = CGSizeMake(0, 3);
label.clipsToBounds = NO;
转的没试过效果