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
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#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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