iOS学习(UI)知识点整理

一、UI小组件

1、UISegmentedControl 分段选择器  实例代码

 1 - (void)viewDidLoad {
 2     [super viewDidLoad];
 3     //分段选择器
 4     //在iOS6里,每个段的宽度会根据字数来决定
 5     //iOS7以后,每个段的宽度相同,宽度取决于最长的字数
 6     self.view.backgroundColor=[UIColor whiteColor];     
 7     seg=[[UISegmentedControl alloc]initWithItems:@[@"消息",@"视频电话"]];      
 8     self.navigationItem.titleView=seg;  
 9     //设置选中的某一个选项   
10     seg.selectedSegmentIndex=1; 
11     
12     UIButton *button=[[UIButton alloc]init];
13     button.frame=CGRectMake(80, 100, 200, 30);
14     button.backgroundColor=[UIColor blackColor];
15     [button setTitle:@"添加" forState:UIControlStateNormal];
16     [button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
17     [button addTarget:self action:@selector(touchButton:) forControlEvents:UIControlEventTouchUpInside];
18     
19     [self.view addSubview:button]; 
20     UIButton *rmbutton=[[UIButton alloc]init];
21     rmbutton.frame=CGRectMake(80, 200, 200, 30);
22     rmbutton.backgroundColor=[UIColor blackColor];
23     [rmbutton setTitle:@"移除" forState:UIControlStateNormal];
24     [rmbutton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
25     [rmbutton addTarget:self action:@selector(touchRmButton:) forControlEvents:UIControlEventTouchUpInside]; 
26     [self.view addSubview:rmbutton]; 
27    //给seg添加点击事件的监听
28     [seg addTarget:self action:@selector(changeView:) forControlEvents:UIControlEventValueChanged]; 
29   }
30 
31 //插入一个图片组成的段
32 -(void)touchButton:(UIButton*)button{     
33     //[seg insertSegmentWithTitle:button.titleLabel.text atIndex:2 animated:YES];
34   [seg insertSegmentWithImage:[UIImage imageNamed:@"005"] atIndex:2 animated:YES];
35     
36 }
37 //移除某一个segment
38 -(void)touchRmButton:(UIButton*)button{     
39     [seg removeSegmentAtIndex:1 animated:YES];     
40 }  
41 //按钮点击事件
42 -(void)changeView:(UISegmentedControl*)mseg{
43     NSLog(@"%li",mseg.selectedSegmentIndex);     
44 }

效果图 如下：

2、UISlider 滑动条 实例代码

 1 - (void)viewDidLoad {
 2     [super viewDidLoad];     
 3     //设置的高度无效
 4     UISlider *slider = [[UISlider alloc]initWithFrame:CGRectMake(10, 100, 300, 200)];
 5     [self.view addSubview:slider];      
 6     //滑块的最大值
 7     slider.maximumValue = 1.0;     
 8     //滑块的最小值
 9     slider.minimumValue = 0.0;     
10     //滑块的当前值
11     slider.value = 0.1;     
12     //是否连续:NO:在滑动过程中,不会响应方法,只有在停止滑动时,才会调用对应的事件方法
13     slider.continuous = YES;     
14     [slider addTarget:self action:@selector(sliderAction:) forControlEvents:UIControlEventValueChanged];
15     
16 }
17 
18 //滑动滑块改变视图背景色
19 -(void)sliderAction:(UISlider *)slider
20 {
21     NSLog(@"%f",slider.value);
22     self.view.backgroundColor = [UIColor colorWithRed:slider.value green:1.0 - slider.value blue:slider.value alpha:1];
23     
24 }

效果图 如下：

3、UIStepper和UiprogressView 步进器与进度条的使用 实例代码

 1 @interface ViewController ()
 2 {
 3     UIPRogressView *_pro;
 4 }
 5 @end
 6 
 7 @implementation ViewController
 8 - (void)viewDidLoad {
 9     [super viewDidLoad];
10     
11     //设置的size信息无效,大小是固定的
12     UIStepper *stepper = [[UIStepper alloc]initWithFrame:CGRectMake(10, 100, 300, 200)];
13     //设置最大值
14     stepper.maximumValue = 100;     
15     //设置最小值
16     stepper.minimumValue = 0;     
17     //设置当前值
18     stepper.value = 10;     
19     //设置步进值
20     stepper.stepValue = 5;     
21     //设置颜色
22     stepper.tintColor = [UIColor orangeColor];
23     [self.view addSubview:stepper];
24      [stepper addTarget:self action:@selector(stepperAction:)  forControlEvents:UIControlEventValueChanged];
25     //进度条,高度无效
26     UIProgressView *pro = [[UIProgressView alloc]initWithFrame:CGRectMake(10, 200, 300, 100)];
27     _pro = pro;
28     
29     //值是0.0-1.0
30     pro.progress = 0.5;     
31     pro.progressTintColor = [UIColor redColor];     
32     [self.view addSubview:pro];
33 }
34 
35 //通过步进器改变进度条的值
36 -(void)stepperAction:(UIStepper *)stepper
37 {
38     NSLog(@"%f",stepper.value);     
39     _pro.progress = stepper.value / stepper.maximumValue;     
40 }

效果图 如下：

4、UISwitch和UIActivityIndicatorView 开关与活动指示器的使用 实例代码

 9 - (void)viewDidLoad {
10     [super viewDidLoad]; 
 
       //注意页面背景色不能为白色，否则看不到活动器因为活动器本身为白色
12     self.view.backgroundColor = [UIColor blackColor];   
14     //长宽无效
15     UISwitch *s = [[UISwitch alloc]init];
16     s.center = self.view.center;
17     //设置UISwitch的开关状态
18     s.on = YES; 
20     [self.view addSubview:s];     
21     [s addTarget:self action:@selector(switchAction:) forControlEvents:UIControlEventValueChanged];     
22     _activity = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
23     [self.view addSubview:_activity];     
24     _activity.center = CGPointMake(100, 100);     
25     [_activity startAnimating];     
   }
28 
29 -(void)switchAction:(UISwitch *)s
30 {
31     NSLog(@"%d",s.on);
32     if (s.on) {
33         //开启活动指示器
34         [_activity startAnimating];
35     }
36     else
37     {
38          //关闭活动指示器
39         [_activity stopAnimating];
40     }
41 }

效果图 如下：

5、UITextView 多行文本框  实例代码

 1 - (void)viewDidLoad {
 2     [super viewDidLoad];
 3     
 4     //解决多行文本框光标不从左上角开始问题
 5     self.automaticallyAdjustsScrollViewInsets = NO;     
 6     //多行文本框
 7     UITextView *tv = [[UITextView alloc]initWithFrame:CGRectMake(10, 100, 300, 100)];
 8     
 9     tv.backgroundColor = [UIColor grayColor];     
10     [self.view addSubview:tv];     
11     tv.delegate = self;
12 }
13 
14 //文本框内容变化时触发;返回值表示能否修改内容
15 - (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
16 {
17     //文本变化范围
18     NSLog(@"%@",NSStringFromRange(range));
19     //文本内容
20     NSLog(@"%@",text);     
21     return YES;  
22 }