最近在学ios 有两句代码没能理解 求大神解答一下
+ (instancetype)new __attribute__
((unavailable("[+new] is not allowed, use [+cameraWithRootView:andCaptureView:]")));
- (instancetype) init attribute ((unavailable("[-init] is not allowed, use [+cameraWithRootView:andCaptureView:]")));