iOS开发实用技巧—项目新特性页面的处理-白红宇

iOS开发实用技巧篇—项目新特性页面的处理

说明：本文主要说明在项目开发中会涉及到的最最简单的新特性界面（实用UIScrollView展示多张图片的轮播）的处理。

代码示例：

新建一个专门的处理新特性界面的控制器，可以实用代码也可以用xib，在这里实用纯代码方式，创建一个控制器NewfeatureViewController。

头文件代码：

1 //  2 // JMNewfeatureViewController.h 3 // 4  5 #import 
    
      6  7 typedef enum:NSInteger 8 { 9 NewfeatureTypeFromeSetting, //从设置界面进入该页 10 NewfeatureTypeFromeWelcom, //第一次安装的时候进入 11 } NewfeatureType;12 13 @interface JMNewfeatureViewController : UIViewController14 15 @property(nonatomic,assign)NewfeatureType newfeatureType;16 17 @end

.m文件代码：

1 //  2 // JMNewfeatureViewController.m 3 // 4  5 #import "JMNewfeatureViewController.h"  6 #import "JMTabBarViewController.h"  7 #import "JMAboutTableViewController.h"  8  9 #define JMNewfeatureImageCount 4 10  11 @interface JMNewfeatureViewController () 
    
      12  13 @property (nonatomic, weak) UIPageControl *pageControl; 14  15  16 - (void)setupScrollView; 17 - (void)setupPageControl; 18 - (void)setupLastImageView:(UIImageView *)imageView; 19 - (void)setupStartButton:(UIImageView *)imageView; 20  21 @end  22  23 @implementation JMNewfeatureViewController 24  25 #pragma mark --------------------- 26 #pragma mark - CycLife 27  28 - (void)viewDidLoad 29 { 30  [super viewDidLoad]; 31  32 [UIApplication sharedApplication].statusBarHidden = YES; 33  34 [self setupScrollView]; // 添加UISrollView  35 [self setupPageControl]; // 添加pageControl  36 } 37  38 #pragma mark --------------------- 39 #pragma mark - Methods 40  41 //添加UISrollView  42 - (void)setupScrollView 43 { 44 // 添加UISrollView  45 UIScrollView *scrollView = [[UIScrollView alloc] init]; 46 scrollView.frame = self.view.bounds; 47 scrollView.bounces = NO; 48 scrollView.delegate = self; 49  [self.view addSubview:scrollView]; 50  51 // 添加图片  52 CGFloat imageW = scrollView.width; 53 CGFloat imageH = scrollView.height; 54 for (int i = 0; i
     
      < pageControl.numberOfPages; i++) {147 UIImageView *imgv = [pageControl.subviews objectAtIndex:i];148 imgv.frame = CGRectMake(imgv.frame.origin.x, imgv.frame.origin.y, 20, 20);149 imgv.image = pageControl.currentPage == i ? imgCurrent : imgOther;150  }151  }152 }153 154 #pragma mark ---------------------155 #pragma mark - Events156 157 //立即体验 158 - (void)start159 {160 [UIApplication sharedApplication].statusBarHidden = NO;161 162 //判断类型 163 if (self.newfeatureType == NewfeatureTypeFromeWelcom) {164 JMTabBarViewController *tabVC = [[JMTabBarViewController alloc]init];165 // 切换控制器 166 UIWindow *window = [UIApplication sharedApplication].keyWindow;167 window.rootViewController = tabVC;168 }else 169  {170 171  [self.navigationController popViewControllerAnimated:YES];172  [self.navigationController setNavigationBarHidden:NO animated:NO];173  }174 175 }176 177 #pragma mark - UIScrollViewDelegate178 - (void)scrollViewDidScroll:(UIScrollView *)scrollView179 {180 // 获得页码 181 CGFloat doublePage = scrollView.contentOffset.x / scrollView.width;182 int intPage = (int)(doublePage + 0.5);183 184 // 设置页码 185 self.pageControl.currentPage = intPage;186  [self changePageControlImage:self.pageControl];187 }188 189 @end

注意点：

　　下面的方法可以为pageControl提供当前状态和默认状态下的图片设置。

1 //改变pagecontrol中圆点样式  2 - (void)changePageControlImage:(UIPageControl *)pageControl 3 { 4 static UIImage *imgCurrent = nil; 5 static UIImage *imgOther = nil; 6 static dispatch_once_t onceToken; 7  8 dispatch_once(&onceToken, ^{ 9 imgCurrent = [UIImage imageNamed:@"yuan_01"];10 imgOther = [UIImage imageNamed:@"yuan1"];11  });12 13 14 if (kSystemVersionMoreThan7) {15 [pageControl setValue:imgCurrent forKey:@"_currentPageImage"];16 [pageControl setValue:imgOther forKey:@"_pageImage"];17 } else {18 for (int i = 0;i < pageControl.numberOfPages; i++) {19 UIImageView *imgv = [pageControl.subviews objectAtIndex:i];20 imgv.frame = CGRectMake(imgv.frame.origin.x, imgv.frame.origin.y, 20, 20);21 imgv.image = pageControl.currentPage == i ? imgCurrent : imgOther;22  }23  }24 }

本例中，新特性部分的业务逻辑非常简单，可以直接套用。

实用图片替换pageControl的效果如下：