iOS基于UIScrollView实现滑动引导页

上代码前，我们先来看下实现的效果图：

welcomeviewcontroller.h

#import <uikit/uikit.h> 
 
@interface welcomeviewcontroller : uiviewcontroller 
 
@end 

welcomeviewcontroller.m 

#import "welcomeviewcontroller.h" 
#define imagecount 3 
 
@interface welcomeviewcontroller () <uiscrollviewdelegate> 
@property (nonatomic, strong)uipagecontrol *pagecontrol; 
 
@end 
 
@implementation welcomeviewcontroller 
 
- (void)viewdidload { 
  [super viewdidload]; 
  //创建scrollview 
  uiscrollview *sv = [[uiscrollview alloc] init]; 
  sv.frame = self.view.bounds; 
  //设置边缘不弹跳 
  sv.bounces = no; 
  //整页滚动 
  sv.pagingenabled = yes; 
  sv.showshorizontalscrollindicator = no; 
   
  //加入多个子视图(imageview) 
  for(nsinteger i=0; i<imagecount; i++){ 
    nsstring *imgname = [nsstring stringwithformat:@"%ld", i+1]; 
    uiimage *image = [uiimage imagenamed:imgname]; 
    uiimageview *imageview = [[uiimageview alloc]initwithimage:image]; 
    cgrect frame = cgrectzero; 
    frame.origin.x = i * sv.frame.size.width; 
    frame.size = sv.frame.size; 
    imageview.frame = frame; 
    [sv addsubview:imageview]; 
     
    if(i==imagecount-1){ 
      //开启图片的用户点击功能 
      imageview.userinteractionenabled = yes; 
      //加个按钮 
      uibutton *button = [[uibutton alloc]init]; 
       
      button.frame = cgrectmake((imageview.frame.size.width-150)/2, imageview.frame.size.height*0.8, 150, 40); 
      button.backgroundcolor = [uicolor orangecolor]; 
      [button settitle:@"立即体验" forstate:uicontrolstatenormal]; 
      button.titlelabel.font = [uifont boldsystemfontofsize:16]; 
      [imageview addsubview:button]; 
      [button addtarget:self action:@selector(enter) forcontrolevents:uicontroleventtouchupinside];    } 
  } 
   
  sv.contentsize = cgsizemake(imagecount * sv.frame.size.width, sv.frame.size.height); 
   
  [self.view addsubview:sv]; 
   
  //加入页面指示控件pagecontrol 
  uipagecontrol *pagecontrol = [[uipagecontrol alloc]init]; 
  self.pagecontrol = pagecontrol; 
  //设置frame 
  pagecontrol.frame = cgrectmake(0, self.view.frame.size.height - 40, self.view.frame.size.width, 20); 
  //分页面的数量 
  pagecontrol.numberofpages = imagecount; 
  //设置小圆点渲染颜色 
  pagecontrol.pageindicatortintcolor = [uicolor whitecolor]; 
  //设置当前选中小圆点的渲染颜色 
  pagecontrol.currentpageindicatortintcolor = [uicolor redcolor]; 
  //关闭用户点击交互 
  pagecontrol.userinteractionenabled = no; 
   
  [self.view addsubview:pagecontrol]; 
   
  sv.delegate = self; 
   
   
} 
- (void)enter 
{ 
  nslog(@"进入应用"); 
} 
 
//uiscrollviewdelegate方法 
- (void)scrollviewdidscroll:(uiscrollview *)scrollview 
{ 
  cgpoint offset = scrollview.contentoffset; 
  if(offset.x<=0){ 
    offset.x = 0; 
    scrollview.contentoffset = offset; 
  } 
  nsuinteger index = round(offset.x / scrollview.frame.size.width); 
  self.pagecontrol.currentpage = index; 
} 
 
- (void)didreceivememorywarning { 
  [super didreceivememorywarning]; 
  // dispose of any resources that can be recreated. 
} 
 
 
@end 

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