Fix the problem that status bar overlaps the view

gistfile1.m

@implementation MyViewController 
  - (void)viewWillAppear:(BOOL)animated {
      if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7) {
          CGRect viewBounds = [self.view bounds];
          viewBounds.origin.y = 18;
          viewBounds.size.height = viewBounds.size.height - 18;
          self.view.frame = viewBounds;
      }
      // Some other code...
      [super viewWillAppear:animated];
  }
@end