iOS开发小点·移除所有子视图

[view.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];

for(UIView *view in [self.view subviews]){
   [view removefromsuperview]
}

[[self.view subviews] enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
   [(UIView*)obj removeFromSuperview];
}];