简单的 IOS 语句理解

Question

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:]")));

Answer 1

http://www.55228885.com/ykLW8Dyp.html