distinctUntilChanged例子：
let disposeBag = DisposeBag()
Observable.of("🐱", "🐷", "🐱", "🐱", "🐱", "🐵", "🐱")
.distinctUntilChanged()
.subscribe(onNext: { print($0) })
.disposed(by: disposeBag)
输出结果
🐱
🐷
🐱
🐵
🐱
let disposeBag = DisposeBag()
Observable.of("🐱", "🐷", "🐱", "🐱", "🐱", "🐵", "🐱")
.distinctUntilChanged()
.subscribe(onNext: { print($0) })
.disposed(by: disposeBag)
输出结果
🐱
🐷
🐱
🐵
🐱
本文标题：distinctUntilChanged
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