設置UI控件的Layer屬性(邊框可見，邊框顏色，邊框寬度，邊框圓角)

設置UI控件的Layer屬性

#import "ViewController.h"

@interface ViewController ()

@property (strong, nonatomic) IBOutlet UIButton *btnSave;

@property (strong, nonatomic) IBOutlet UIView *yellowView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //獲取button的圖層
    CALayer *layer = self.btnSave.layer;
    //設置button圖層的邊框可見(只有masks遮住bounds，這樣bounds才可見，否則都是透明的)
    layer.masksToBounds = YES;
    //設置button圖層的邊框顏色
    layer.borderColor = [UIColor redColor].CGColor;
    //設置button圖層的邊框寬度
    layer.borderWidth = 2;
    
    //設置button圖層的角度半徑
    layer.cornerRadius = 10.0;
    
    
    self.yellowView.layer.masksToBounds = YES;
    self.yellowView.layer.borderColor = [UIColor blueColor].CGColor;
    
}