1、通过设置CALayer来给视图控件添加阴影

#import "ViewController.h"

@interface ViewController ()

/**
 *  测试View
 */
@property (nonatomic, strong) UIView *testView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.testView = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
    self.testView.backgroundColor = [UIColor orangeColor];
    
    //0、圆角
    self.testView.layer.cornerRadius = 5;
    //1、设置图层阴影的范围
    self.testView.layer.shadowRadius = 10;
    //2、设置图层阴影的偏移量
    self.testView.layer.shadowOffset = CGSizeMake(10, -10);
    //3、设置图层阴影的颜色
    self.testView.layer.shadowColor = [UIColor blackColor].CGColor;
    //4、设置图层阴影的透明度
    self.testView.layer.shadowOpacity = 0.7;
    //5、添加边框宽度
    self.testView.layer.borderWidth = 3.0;
    //6、添加边框颜色
    self.testView.layer.borderColor = [UIColor blackColor].CGColor;
    
    [self.view addSubview:self.testView];
}

2、效果如下：

QQ20161221-1@2x.png