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:0 animated:YES];
[mySegment insertSegmentWithTitle:@"处理" atIndex:1 animated:YES];
mySegment.segmentedControlStyle = UISegmentedControlStyleBar;
mySegment.selectedSegmentIndex = 0;
[self.navigationController.navigationBar addSubview:mySegment];