IOS开发基础知识--碎片2

六:获得另一个控件器,并实现跳转

UIStoryboard* mainStoryboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];

UIViewController *registerViewController = [mainStoryboard instantiateViewControllerWithIdentifier:@"registerViewController"];

registerViewController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

[self presentViewController:registerViewController animated:YES completion:^{

NSLog(@"Present Modal View");

}];

另一种用segue连接：

如果在storyboard中当前的ViewController和要跳转的ViewController之间的segue之间存在，则可以执行performSegueWithIdentifier：sender：这个方法实现跳转。

　　比如：[self performSegueWithIdentifier:@"go" sender:self];

　　　　　其中，go为自己定义的segue标识符。

其中registerViewController是第二个视图中标识检查器Storyboard ID的值

七:判断IOS版本

判断IOS是不是7.0以后的

if([[[UIDevice currentDevice] systemVersion] floatValue]>=7.0) {

}

八:Button不同状态下背景图片

[_registerButton setBackgroundImage:[UIImage imageNamed:@"3signbutton-n.png"] forState:UIControlStateNormal];

[_registerButton setBackgroundImage:[UIImage imageNamed:@"3signbutton-s.png"] forState:UIControlStateHighlighted];

九:判断设备是3.5寸还是4寸

if ([[UIScreen mainScreen] currentMode].size.height == 480||[[UIScreenmainScreen] currentMode].size.height == 960)

{

//这是3.5寸的iPhone设备

}

else

{     //这是4寸的iPhone设备 }

十:viewDidLoad中调用

无论你是通过xib文件还是重写loadView方法创建UIViewController的view，在view创建完毕后，最终都会调用viewDidLoad方法,一般我们会在这里做界面上的初始化操作，比如往view中添加一些子视图、从数据库或者网络加载模型数据装配到子视图中

- (void)viewDidLoad
 {
     [super viewDidLoad];

     // 添加一个按钮
     UIButton *button = [UIButton buttonWithType:UIButtonTypeContactAdd];
     [button addTarget:self action:@selector(click) forControlEvents:UIControlEventTouchUpInside];
     [self.view addSubview:button];
 }

十一:树形结构导航问题(UINavigationController)

1:如何修改第二页的返回back文字

应该在第一页的viewDidLoad里面进行修改(假设从A界面push到B界面，希望改变B界面的返回按钮标题，则在A界面中加入代码),代码如下:

-(void)viewDidLoad
{
UIBarButtonItem *backItem = [[[UIBarButtonItem alloc] init] autorelease];

backItem.title = @"返回";

self.navigationItem.backBarButtonItem = backItem;
}

2:如何增加一个控件在标头

在本页的viewDidLoad里面进行增加;代码如下:

-(void)viewDidLoad
{
UIBarButtonItem* Done=[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(DownShow)];
self.navigationItem.rightBarButtonItem=Done;
}

-(void)DownShow
{

}

其中按键类型如下(带有不同的图标):

    UIBarButtonSystemItemDone,
    UIBarButtonSystemItemCancel,
    UIBarButtonSystemItemEdit,
    UIBarButtonSystemItemSave,
    UIBarButtonSystemItemAdd,
    UIBarButtonSystemItemFlexibleSpace,
    UIBarButtonSystemItemFixedSpace,
    UIBarButtonSystemItemCompose,
    UIBarButtonSystemItemReply,
    UIBarButtonSystemItemAction,
    UIBarButtonSystemItemOrganize,
    UIBarButtonSystemItemBookmarks,
    UIBarButtonSystemItemSearch,
    UIBarButtonSystemItemRefresh,
    UIBarButtonSystemItemStop,
    UIBarButtonSystemItemCamera,
    UIBarButtonSystemItemTrash,
    UIBarButtonSystemItemPlay,
    UIBarButtonSystemItemPause,
    UIBarButtonSystemItemRewind,
    UIBarButtonSystemItemFastForward,
    UIBarButtonSystemItemUndo,
    UIBarButtonSystemItemRedo,
    UIBarButtonSystemItemPageCurl//只能在ToolBar上显示

3:如何修改标头的色彩

self.navigationController.navigationBar.tintColor=[UIColor redColor];

4:增加其它UISegment,UISwith控件

在本页viewDidLoad中增加如下代码,

    UISegmentedControl *mySegment;

    mySegment = [[UISegmentedControl alloc] initWithFrame:CGRectMake(218.0f, 8.0, 100.0f, 30.0f)];

    [mySegment insertSegmentWithTitle:@"分配" atIndex: animated:YES];

    [mySegment insertSegmentWithTitle:@"处理" atIndex: animated:YES];

    mySegment.segmentedControlStyle = UISegmentedControlStyleBar;

    mySegment.selectedSegmentIndex = ;

    [self.navigationController.navigationBar addSubview:mySegment];