iOS:步进UIStepper、滑动块UISlider、开关UISwitch的基本使用

步进UIStepper、滑动块UISlider：当它们作为事件,被触发时，它们的值会发生改变。正因为如此,触发该事件时，可以一张一张翻阅浏览图片,，，，

步进UIStepper：

@property(nonatomic) double minimumValue;                 // default 0. must be less than maximumValue

@property(nonatomic) double maximumValue;                // default 100. must be greater than minimumValue

@property(nonatomic) double stepValue;                         // default 1. must be greater than 0，每次步进的距离

 //滑动块触发事件(值value发生改变,范围mininum~maxnum)
 - (IBAction)sliderValueChange:(UISlider *)sender
 {
     NSLog(@"%lf",sender.value);
     //将滑动块的值取出并赋给步进,使得步进和滑动块事件状态相同
     [self.stepper setValue:sender.value];
 }

滑动块UIStepper：

@property(nonatomic) float value;                                 // default 0.0. this value will be pinned to min/max

@property(nonatomic) float minimumValue;                   // default 0.0. the current value may change if outside new min value

@property(nonatomic) float maximumValue; 　　　　　　// default 1.0. the current value may change if outside new max value

 //步进触发事件(值value发生改变,范围mininum~maxnum，可以设置步进大小step值)
 - (IBAction)stepperValueChange:(UIStepper *)sender
 {
     NSLog(@"%lf",sender.value);
     //将步进的值取出并赋给滑动块,使得步进和滑动块事件状态相同
     [self.slider setValue:sender.value];
 }

开关UISwitch:

@property(nonatomic,getter=isOn) BOOL on;                //有两种状态,开on或关off

 //开关触发事件(状态state只有两种形式:on、off)
 - (IBAction)switchValueChange:(UISwitch *)sender
 {
     NSLog(@"%@",sender.isOn?@"开":@"关");
 }

以下用步进和滑动块、开关做的一个图片浏览器

源码如下：

 //  ViewController.m
 //  02-图片浏览器
 //
 //  Created by ma c on 15/8/27.
 //  Copyright (c) 2015年 bjsxt. All rights reserved.
 //

 #import "ViewController.h"

 @interface ViewController ()
 @property (weak, nonatomic) IBOutlet UILabel *labelTitle;
 @property (weak, nonatomic) IBOutlet UILabel *labelInfo;
 @property (weak, nonatomic) IBOutlet UIImageView *imageView;
 @property (weak, nonatomic) IBOutlet UIStepper *stepper;
 @property (weak, nonatomic) IBOutlet UISlider *slider;
 @property (strong,nonatomic) NSArray *imageInfos;
 @property (assign,nonatomic) NSInteger index;//显示当前图片的索引
 @property (assign,nonatomic) NSInteger total;//图片的个数
 @end

 @implementation ViewController
 - (IBAction)stepperValueChange:(UIStepper *)sender
 {
     [self.slider setValue:sender.value];
     self.index = [self.stepper value];
     [self setImageIndex:self.index];
 }
 - (IBAction)sliderValueChange:(UISlider *)sender
 {
     [self.stepper setValue:sender.value];
     self.index = [self.slider value];
     [self setImageIndex:self.index];
 }

 - (void)viewDidLoad {
     [super viewDidLoad];
     //加载图片信息
     NSString *path = [[NSBundle mainBundle] pathForResource:@"images" ofType:@"plist"];
     self.imageInfos = [NSArray arrayWithContentsOfFile:path];

     //初始化
     self.total = [self.imageInfos count];
     self.index = ;

     self.stepper.minimumValue = ;
     self.stepper.maximumValue = self.total - ;
     self.stepper.value = ;
     self.stepper.stepValue = ;

     self.slider.minimumValue = ;
     self.slider.maximumValue = self.total - ;
     self.slider.value = ;

     self.imageView.contentMode = UIViewContentModeScaleAspectFit;
     [self setImageIndex:];

 }

 -(void)setImageIndex:(NSUInteger)index
 {

     //取出数组中的字典
     NSDictionary *dicImage = self.imageInfos[index];
     NSString *imageName = [dicImage objectForKey:@"icon"];
     NSString *imageTitle = [dicImage objectForKey:@"title"];

     //设置显示的图片
     self.imageView.image = [UIImage imageNamed:imageName];

     //设置显示的图片的标题
     self.labelTitle.text = imageTitle;

     //设置当前信息：索引/总数
     self.labelInfo.text = [NSString stringWithFormat:@"%ld/%ld",self.index+,self.total];
 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 @end