Question

ios navigationbar 不能添加控件是怎么回事

Answer 1

1.在固定位置添加UIBarButtonItem
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UIBarButtonItem *myButton = [[[UIBarButtonItem alloc]
initWithTitle:@"myButton"
style:UIBarButtonItemStyleBordered
target:self
action:@selector(action)]autorelease];
self.navigationItem.leftBarButtonItem = myButton;
//self.navigationItem.rightBarButtonItem = myButton;
//self.navigationItem.backBarButtonItem = myButton;
[myButton release];

NavigationItem类有以下一些成员：
-title
-titleview
-backBarButtonItem//这是有返回上一级事件的后退按钮
-rightBarButtonItem
-leftBarButtonItem
2.在任意位置添加一个UIToolbar叠加到navigationBar上，然后设置其背景透明，则可以实现在上这个navigationBar 上面添加多个按钮的效果
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UIToolbar *mycustomToolBar;
NSMutableArray *mycustomButtons = [[NSMutableArray alloc] init];
UIBarButtonItem *myButton1 = [[[UIBarButtonItem alloc]
initWithTitle:@"Get5"
style:UIBarButtonItemStyleBordered
target:self
action:@selector(action)]autorelease];
myButton1.width = 40;
[mycustomButtons addObject: myButton1];
UIBarButtonItem *myButton2 = [[[UIBarButtonItem alloc]
initWithTitle:@"Play5"
style:UIBarButtonItemStyleBordered
target:self
action:@selector(action)]autorelease];
myButton2.width = 40;
[mycustomButtons addObject: myButton2];

mycustomToolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0.0f, 0.0f,320.0f, 44.0f)];
//mycustomToolBar.center = CGPointMake(160.0f,200.0f);
mycustomToolBar.barStyle = UIBarStyleDefault;
[mycustomToolBar setItems:mycustomButtons animated:YES];
[mycustomToolBar sizeToFit];
[self.view addSubview:mycustomToolBar];
//self.navigationItem.titleView = mycustomToolBar;//与上一句都可实现在上面叠加工具条
//将toolbar的颜色设置为透明，总之使用两个控件叠加完美
[mycustomToolBar release];
[mycustomButtons release];

这里是在UIToolbar 上面添加UIBarButtonItem,然而我们很多时候可能会添加其它控件，如：switch,label等等，所以在UIToolbar上面如何添加各种控件，就参考下一篇文章。
3.在任意位置添加UISegmentedControl
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UISegmentedControl * mySegment;
mySegment = [[UISegmentedControl alloc]
initWithFrame:CGRectMake(5.0f, 10.0, 60.0f, 30.0f)];
[mySegment insertSegmentWithTitle:@"mySeg1" atIndex:0 animated:YES];
[get5Segment insertSegmentWithTitle:@"mySeg2" atIndex:1 animated:YES];
mySegment.segmentedControlStyle = UISegmentedControlStyleBar;
[mySegment addTarget:self action:@selector(segAction:) forControlEvents:UIControlEventValueChanged];
mySegment.selectedSegmentIndex = -1;
[self.navigationController.navigationBar addSubview: mySegment];
[mySegment release];

如果要在navigationBar实现多个按钮，而且某个功能块的类似按钮需要挨在一起，用segment实现还是很不错，用UIBarButtonItem实现的话，按钮间总是有一个间隔。
4.在任意位置添加UILabel
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UILabel* myLabel;
myLabel=[[UILabel alloc] initWithFrame:CGRectMake(100.0f, 14.0f, 100.0f, 10.0f)];
myLabel.font=[UIFont systemFontOfSize:10];
myLabel.backgroundColor = [UIColor clearColor];
[self.navigationController.navigationBar addSubview: myLabel];
[myLabel release];

5.在任意位置添加UIProgressView
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UIProgressView *myProgress;
myProgress =[[UIProgressView alloc] initWithFrame:CGRectMake(80.0f, 28.0f, 150.0f, 8.0f)];
[self.navigationController.navigationBar addSubview: myProgress];
[myProgress release];
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