CGRect frame = CGRectZero; frame = [self convertRect:self.bounds toView:self.superView]; frame = [self.superView convertRect:self.bounds fromView:self]; frame = [self.superView convertRect:self.frame toView:self.superView]; frame = self.frame; 以上のコードでは全て同じ結果を得られます。 self.frameとは[self convertRect:self.bounds toView:self.superView];のシンタックスシュガーみたいなものである、と覚えておけば、このメソッドで引っかかることもなくなるような気がします。 convertRect
![convertRect:toView:系メソッドについて。 - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/0f134509cbb01f15c8b9ab0be73c12b9191246c0/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Fogp-background-1150d8b18a7c15795b701a55ae908f94.png%3Fixlib%3Drb-1.2.2%26w%3D1200%26mark%3Dhttps%253A%252F%252Fqiita-user-contents.imgix.net%252F~text%253Fixlib%253Drb-1.2.2%2526w%253D840%2526h%253D380%2526txt%253DconvertRect%25253AtoView%25253A%2525E7%2525B3%2525BB%2525E3%252583%2525A1%2525E3%252582%2525BD%2525E3%252583%252583%2525E3%252583%252589%2525E3%252581%2525AB%2525E3%252581%2525A4%2525E3%252581%252584%2525E3%252581%2525A6%2525E3%252580%252582%2526txt-color%253D%252523333%2526txt-font%253DAvenir-Black%2526txt-size%253D54%2526txt-clip%253Dellipsis%2526txt-align%253Dcenter%25252Cmiddle%2526s%253D07ebfc1d5cc012450a359fe924bd1ab2%26mark-align%3Dcenter%252Cmiddle%26blend%3Dhttps%253A%252F%252Fqiita-user-contents.imgix.net%252F~text%253Fixlib%253Drb-1.2.2%2526w%253D840%2526h%253D500%2526txt%253D%252540glayash%2526txt-color%253D%252523333%2526txt-font%253DAvenir-Black%2526txt-size%253D45%2526txt-align%253Dright%25252Cbottom%2526s%253D49ed46d3e209f9a0f6472449b99ff740%26blend-align%3Dcenter%252Cmiddle%26blend-mode%3Dnormal%26s%3D85f7e643d38b946815163d4c82b06127)