提交：修改iOS系统扫描框的样式；

ios/Classes/SDScanMaskView.m

@@ -36,13 +36,15 @@
     
     if (self = [super initWithFrame:frame]) {
         self.config = config;
-        [self addSubview:self.maskView];
+//        [self addSubview:self.maskView];
         [self addSubview:self.exitButton];
         [self addSubview:self.titleLabel];
-        [self addSubview:self.topLeftImageView];
-        [self addSubview:self.topRightImageView];
-        [self addSubview:self.bottomLeftImageView];
-        [self addSubview:self.bottomRightImageView];
+
+//        [self addSubview:self.topLeftImageView];
+//        [self addSubview:self.topRightImageView];
+//        [self addSubview:self.bottomLeftImageView];
+//        [self addSubview:self.bottomRightImageView];
+
         [self addSubview:self.scanLineImageView];
         [self addSubview:self.hintLabel];
         [self startScanLineAnimationAction];