ios学习--UISegmentedControl详解
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当用户输入不仅仅是布尔值时,可使用分段控件(UISegmentedControl)。分段控件提供一栏按钮(有时称为按钮栏),但只能激活其中一个按钮。分段控件会导致用户在屏幕上看到的内容发生变化。它们常用于在不同类别的信息之间选择,或在不同的应用屏幕之间切换。下面介绍基本属性和基本方法的使用.
NSArray *segmentedArray = [[NSArrayalloc]initWithObjects:
@"1"
,
@"2"
,
@"3"
,
@"4"
,nil];
2
//初始化UISegmentedControl
3
UISegmentedControl *segmentedControl = [[UISegmentedControlalloc]initWithItems:segmentedArray];
4
segmentedControl.frame = CGRectMake(20.0, 20.0, 250.0, 50.0);
5
segmentedControl.selectedSegmentIndex = 2;
//设置默认选择项索引
6
segmentedControl.tintColor = [UIColor redColor];
7
//有基本四种样式
//但是这个在ios7之后,出于扁平化风格的考虑,这些style都不在有效了
8
segmentedControl.segmentedControlStyle = UISegmentedControlStylePlain;
//设置样式
//segmentedControl.segmentedControlStyle = UISegmentedControlStyleBordered;//设置样式
//segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;//设置样式
//segmentedControl.segmentedControlStyle = UISegmentedControlStyleBezeled;//设置样式
// segmentedControl.momentary = YES;//设置在点击后是否恢复原样
2
[segmentedControl setTitle:
@"two"
forSegmentAtIndex:1];
//设置指定索引的题目
[segmentedControl setImage:[UIImage imageNamed:
@"btn_jyy.png"
] forSegmentAtIndex:3];
//设置指定索引的图片
[segmentedControl insertSegmentWithImage:[UIImage imageNamed:
@"mei.png"
] atIndex:2 animated:NO];
//在指定索引插入一个选项并设置图片
[segmentedControl insertSegmentWithTitle:
@"insert"
atIndex:3 animated:NO];
//在指定索引插入一个选项并设置题目
[segmentedControl removeSegmentAtIndex:0 animated:NO];
//移除指定索引的选项
// [segmentedControl setWidth:70.0 forSegmentAtIndex:2];//设置指定索引选项的宽度
02
// [segmentedControl setContentOffset:CGSizeMake(10.0,10.0) forSegmentAtIndex:4];//设置选项中图片等的左上角的位置
03
04
//获取指定索引选项的图片imageForSegmentAtIndex:
05
UIImageView *imageForSegmentAtIndex = [[UIImageViewalloc]initWithImage:[segmentedControl imageForSegmentAtIndex:1]];
06
imageForSegmentAtIndex.frame = CGRectMake(60.0, 120.0, 30.0, 30.0); ;
07
08
//获取指定索引选项的标题titleForSegmentAtIndex
09
UILabel *titleForSegmentAtIndex = [[UILabel alloc]initWithFrame:CGRectMake(100.0, 160.0, 30.0, 30.0)];
10
titleForSegmentAtIndex.text = [segmentedControl titleForSegmentAtIndex:0];
11
12
//获取总选项数segmentedControl.numberOfSegments
13
UILabel *numberOfSegments = [[UILabel alloc]initWithFrame:CGRectMake(140.0, 170.0, 30.0, 30.0)];
14
numberOfSegments.text = [NSString stringWithFormat:
@"%d"
,segmentedControl.numberOfSegments];
15
16
//获取指定索引选项的宽度widthForSegmentAtIndex:
17
UILabel *widthForSegmentAtIndex = [[UILabel alloc]initWithFrame:CGRectMake(180.0, 210.0, 70.0, 30.0)];
18
widthForSegmentAtIndex.text = [NSString stringWithFormat:
@"%f"
,[segmentedControl widthForSegmentAtIndex:2]];
19
20
// [segmentedControl setEnabled:NO forSegmentAtIndex:4];//设置指定索引选项不可选
21
// BOOL enableFlag = [segmentedControl isEnabledForSegmentAtIndex:4];//判断指定索引选项是否可选
22
[mySegmentedControladdTarget:selfaction:@selector(segmentAction:)forControlEvents:UIControlEventValueChanged];
//添加委托方法
23
//具体委托方法实例
24
-(
void
)segmentAction:(UISegmentedControl *)Seg{
25
NSInteger Index = Seg.selectedSegmentIndex;
26
NSLog(
@"Index %i"
, Index);
27
switch
(Index) {
28
case
0:
29
[self selectmyView1];
30
break
;
31
case
1:
32
[self selectmyView2];
33
break
;
34
case
2:
35
[self selectmyView3];
36
break
;
37
case
3:
38
[self selectmyView4];
39
break
;
40
case
4:
41
[self selectmyView5];
42
break
;
43
case
5:
44
[self selectmyView6];
45
break
;
46
default
:
47
break
;
48
}
49
}
基本属性、方法如上,大家在实际开发中可根据实际需求选取适当属性和方法。
Segment的行为和外观
segment.momentary = NO;
//默认为NO 当设置为YES时,当被选中后,一会儿后不显示被选中状态(最左边的样子),不选中状态即下图的右边几个按钮一样
segment.segmentedControlStyle = UISegmentedControlStyleB
typedef enum {
} UISegmentedControlStyle;
//设置样式 当为Bordered和Bar时tintColor才有效 下图为tintcolor为红色时的样子
//但是这个在ios7之后,出于扁平化风格的考虑,这些style都不在有效了
//Bar样式
//Bordered
[segment setEnabled:NO];
[segment setEnabled:NO forSegmentAtIndex:2];//设置下标为2的segment不可用
[segment setWidth:100 forSegmentAtIndex:2];
[segment setContentOffset:CGSizeMake(10, 10) forSegmentAtIndex:2];//设置内容偏移
segment.apportionsSegmentWidthsB
自定义外观
[segment setTintColor:[UIColor redColor]];
[segment setBackgroundImage:[UIImage imageNamed:@""] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
typedef enum {
} UIBarMetrics;
//设置在某个状态下segments的背景图片
[segment setTitleTextAttributes:dic forState:UIControlStateNormal];
NSString *const UITextAttributeFont;
NSString *const UITextAttributeTextColor
NSString *const UITextAttributeTextShado
NSString *const UITextAttributeTextShado
NSDictionary *dic = [NSDictionary dictionaryWithObjectsAnd
//设置标题的颜色 字体和大小 阴影和阴影颜色
[segment addTarget:self action:@selector(change:) forControlEvents:UIControlEventValueChang
//当选中不同的segment时,会执行change:方法
UISegmentedControl分段控件代替了桌面OS上的单选按钮。不过它的选项个数非常有限,因为你的IOS设备屏幕有限。当我们需要使用选项非常少的单选按钮时它很合适。
一、创建
UISegmentedControl*mySegmentedControl = [[UISegmentedControlalloc]initWithItems:nil];
是不是很奇怪没有指定位置和大小呢?没错,我确实在他的类声明里只找到 initWithItems 而未找到 initWithFrame ,所以他不需要指定,不过我看到了另一个方法,这个方法可以设置Item的宽度:
- mySegmentedControl
setWidth:100 forSegmentAtIndex:0];//设置Item的宽度
二、属性
- mySegmentedControl.segmentedControlStyle
= UISegmentedControlStyleB ar;//风格
- typedef
enum { -
UISegmentedControlStyleP lain, // large plain 有灰边的大白按钮,适合偏好设置单元 -
UISegmentedControlStyleB ordered, // large bordered 黑边的大白按钮,适用于表格单元 -
UISegmentedControlStyleB ar, // small button/nav bar style. tintable 小按钮,适合导航栏 -
UISegmentedControlStyleB ezeled, // large bezeled style. tintable - }
UISegmentedControlStyle;
- UIColor
*myTint = [[ UIColor alloc]initWithRed:0.66 green:1.0 blue:0.77 alpha:1.0]; -
mySegmentedControl.tintColor = myTint;
每个分段控件的片段都是一个按钮,其中包含一个标签或图片。你需要在你的控件中为每个控件创建一个片段。只要屏幕放得下,就可以有许多片段,但用户同一时刻只能选择一个片段。
- [mySegmentedControl
insertSegmentWithTitle:@"First" atIndex:0 animated:YES]; -
[mySegmentedControl insertSegmentWithTitle:@"Second" atIndex:2 animated:YES];
按钮都被赋予一个索引,用这个索排序以及标识。
你也可以添加一个含有图像的片段,用inserSegmentWithImage
- [mySegmentedControl
insertSegmentWithImage:[UIImage imageNamed:@"pic"] atIndex:3 animated:YES];
- [mySegmentedControl
removeSegmentAtIndex:0 animated:YES];//删除一个片段 -
[mySegmentedControl removeAllSegments];//删除所有片段
- [mySegmentedControl
setTitle:@"ZERO" forSegmentAtIndex:0];//设置标题 -
NSString* myTitle = [mySegmentedControl titleForSegmentAtIndex:1];//读取标题
每个分段也可以设置图像:
- [mySegmentedControl
setImage:[UIImage imageNamed:@"pic"] forSegmentAtIndex:1];//设置 -
UIImage* myImage = [mySegmentedControl imageForSegmentAtIndex:2];//读取
六、选中分段
分段控件的默认行为是,一旦按钮被选中就一直保持,直到另外一个按钮被选中为止。你可以改变这种默认的行为,变成按钮按下后很快就自动释放。将控件的momentary属性设为YES:
- mySegmentedControl.momentary
= YES;
初始化默认片段
默认情况下,除非你指定,否则不会有任何片段被选中。要设置
- mySegmentedControl.selectedSegmentedIndex
= 0;
- [parentView
addSubview:mySegmentedControl];//添加到父视图 -
或 -
self.navigationItem.titleView = mySegmentedControl;//添加到导航栏
通过
- int
x = mySegmentedControl. selectedSegmentedIndex;
要接收片段选取的通知,可以用UIControl类的 addTarget 方法,为 UIControlEventValueChang
- [mySegmentedControl
addTarget:self action:@selector(selected:) forControlEvents:UIControlEventValueChang ed];
- -(void)selected:(id)sender{
-
UISegmentedControl* control = (UISegmentedControl*)sender; -
switch (control.selectedSegmentIndex) { -
case 0: -
// -
break; -
case 1: -
// -
break; -
case 2: -
// -
break; -
-
default: -
break; -
} - }
EG: 在导航栏中添加UISegmentedControl !!!
代码:
//自定义UISegmentedcontrol
02
UISegmentedControl *segmentedControl=[[UISegmentedControl alloc] initWithFrame:CGRectMake(80.0f, 8.0f, 200.0f, 30.0f) ];
03
[segmentedControl insertSegmentWithTitle:
@"Food to eat"
atIndex:0 animated:YES];
04
[segmentedControl insertSegmentWithTitle:
@"Food to avoid"
atIndex:1 animated:YES];
05
segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
06
segmentedControl.momentary = YES;
07
segmentedControl.multipleTouchEnabled=NO;
08
[segmentedControl addTarget:self action:@selector(Selectbutton:) forControlEvents:UIControlEventValueChanged];
09
UIBarButtonItem *segButton = [[UIBarButtonItem alloc] initWithCustomView:segmentedControl];
//自定义UIBarButtonItem,封装定义好的UIsegmented。
10
[segmentedControl release];
11
self.navigationItem.rightBarButtonItem = segButton;
//添加到导航栏中
12
[segButton release];
// [segmentedControl setWidth:70.0 forSegmentAtIndex:2];//设置指定索引选项的宽度
02
// [segmentedControl setContentOffset:CGSizeMake(10.0,10.0) forSegmentAtIndex:4];//设置选项中图片等的左上角的位置
03
04
//获取指定索引选项的图片imageForSegmentAtIndex:
05
UIImageView *imageForSegmentAtIndex = [[UIImageViewalloc]initWithImage:[segmentedControl imageForSegmentAtIndex:1]];
06
imageForSegmentAtIndex.frame = CGRectMake(60.0, 120.0, 30.0, 30.0); ;
07
08
//获取指定索引选项的标题titleForSegmentAtIndex
09
UILabel *titleForSegmentAtIndex = [[UILabel alloc]initWithFrame:CGRectMake(100.0, 160.0, 30.0, 30.0)];
10
titleForSegmentAtIndex.text = [segmentedControl titleForSegmentAtIndex:0];
11
12
//获取总选项数segmentedControl.numberOfSegments
13
UILabel *numberOfSegments = [[UILabel alloc]initWithFrame:CGRectMake(140.0, 170.0, 30.0, 30.0)];
14
numberOfSegments.text = [NSString stringWithFormat:
@"%d"
,segmentedControl.numberOfSegments];
15
16
//获取指定索引选项的宽度widthForSegmentAtIndex:
17
UILabel *widthForSegmentAtIndex = [[UILabel alloc]initWithFrame:CGRectMake(180.0, 210.0, 70.0, 30.0)];
18
widthForSegmentAtIndex.text = [NSString stringWithFormat:
@"%f"
,[segmentedControl widthForSegmentAtIndex:2]];
19
20
// [segmentedControl setEnabled:NO forSegmentAtIndex:4];//设置指定索引选项不可选
21
// BOOL enableFlag = [segmentedControl isEnabledForSegmentAtIndex:4];//判断指定索引选项是否可选
22
[mySegmentedControladdTarget:selfaction:@selector(segmentAction:)forControlEvents:UIControlEventValueChanged];
//添加委托方法
23
//具体委托方法实例
24
-(
void
)segmentAction:(UISegmentedControl *)Seg{
25
NSInteger Index = Seg.selectedSegmentIndex;
26
NSLog(
@"Index %i"
, Index);
27
switch
(Index) {
28
case
0:
29
[self selectmyView1];
30
break
;
31
case
1:
32
[self selectmyView2];
33
break
;
34
case
2:
35
[self selectmyView3];
36
break
;
37
case
3:
38
[self selectmyView4];
39
break
;
40
case
4:
41
[self selectmyView5];
42
break
;
43
case
5:
44
[self selectmyView6];
45
break
;
46
default
:
47
break
;
48
}
49
}
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