iOS开发点滴

设置navigation titleView 居中

添加左边按钮后再添加titleView会导致titleView不居中，之前是直接用UIImageView直接赋值给titleView宽度默认为屏幕宽度除去左边按钮所以不居中。应该用UIView添加UIImageview再赋值给titleView。

    UIView *vc = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 44)];
//    vc.backgroundColor = RandomColor;
    
    UIImageView *titleView = [[UIImageView alloc] init];
    titleView.frame = vc.frame;
    titleView.contentMode = UIViewContentModeScaleAspectFit;
    [titleView setImage:[UIImage imageNamed:@"hos"]];
    [vc addSubview:titleView];
    self.navigationItem.titleView = vc;

获取父类的navigationController

[self.parentViewController.navigationController popViewControllerAnimated:YES];

设置tableView section间隔

- (CGFloat)tableView:(UITableView*)tableView
heightForHeaderInSection:(NSInteger)section {
    if (section == 0) {
        return 6.0;
    }
    return 1.0;
}
- (CGFloat)tableView:(UITableView*)tableView
heightForFooterInSection:(NSInteger)section {
    return 5.0;
}
- (UIView*)tableView:(UITableView*)tableView
viewForHeaderInSection:(NSInteger)section {
    return [[UIView alloc] initWithFrame:CGRectZero];
}
- (UIView*)tableView:(UITableView*)tableView
viewForFooterInSection:(NSInteger)section {
    return [[UIView alloc] initWithFrame:CGRectZero];
}