self.view.backgroundColor = [UIColor colorWithRed:arc4random() % 255/255.f green:arc4random() % 255/255.f blue:arc4random() % 255/255.f alpha:1];
self.view.backgroundColor = [UIColor colorWithRed:arc4random() % 255/255.f green:arc4random() % 255/255.f blue:arc4random() % 255/255.f alpha:1];
本文标题：随机颜色 《笔记篇》
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