iOS引导页动画(封装好)

//直接上代码,在外面只要调用,传入图片数组即可.
//  Created by 刘志武 on 2016/12/3.
//  Copyright © 2016年 zhiwuLiu. All rights reserved.
//

#import "LaunchView.h"

#define L_Base_Tag  10000
#define L_Rotate_Rate 1
#define L_SCREEN_WIDHT [UIScreen mainScreen].bounds.size.width  //屏幕宽度
#define L_SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height    //屏幕高

@implementation LaunchView


-(instancetype)initWithFrame:(CGRect)frame{
    self = [super initWithFrame:frame];
    
    if (self) {
        
    }
    return self;
}

//重写图片数组的setter方法
-(void)setImagesArray:(NSArray *)imagesArray
{
    _imagesArray = imagesArray;
    
    [self creatSubViews];
}

-(void)creatSubViews
{
    NSArray *imageArr = [NSArray arrayWithArray:_imagesArray];
        
    UIScrollView *mainScrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, L_SCREEN_WIDHT, L_SCREEN_HEIGHT)];
    mainScrollView.pagingEnabled = YES;
    mainScrollView.bounces = NO;
    mainScrollView.contentSize = CGSizeMake(L_SCREEN_WIDHT*imageArr.count, L_SCREEN_HEIGHT);
    mainScrollView.showsHorizontalScrollIndicator = NO;
    mainScrollView.delegate = self;
    [self addSubview:mainScrollView];
    
    //添加云彩图片
    UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 330, L_SCREEN_WIDHT, 170*L_SCREEN_WIDHT/1242.0)];
    imageView.image = [UIImage imageNamed:@"yun.png"];
    [self addSubview:imageView];
    
    
    for (int i=0; i<imageArr.count; i++) {
        UIView *rotateView = [[UIView alloc]initWithFrame:CGRectMake(L_SCREEN_WIDHT*i, 0, L_SCREEN_WIDHT, L_SCREEN_HEIGHT*2)];
        [rotateView setTag:L_Base_Tag+i];
        [mainScrollView addSubview:rotateView];
        if (i!=0) {
            rotateView.alpha = 0;
        }
        
        UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, L_SCREEN_WIDHT, L_SCREEN_HEIGHT)];
        imageView.image = [UIImage imageNamed:imageArr[i]];
        [rotateView addSubview:imageView];
        
        //最后页面添加按钮
        if (i == imageArr.count-1) {
            UIControl *control = [[UIControl alloc]initWithFrame:CGRectMake(0, L_SCREEN_HEIGHT-80, L_SCREEN_WIDHT, 50)];
            control.backgroundColor = [UIColor blackColor];
            [control addTarget:self action:@selector(ClickToRemove) forControlEvents:UIControlEventTouchUpInside];
            [rotateView addSubview:control];
        }
    }
    
    UIView *firstView = [mainScrollView viewWithTag:L_Base_Tag];
    [mainScrollView bringSubviewToFront:firstView];
    

    
}
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
    
    UIView * view1 = [scrollView viewWithTag:L_Base_Tag];
    UIView * view2 = [scrollView viewWithTag:L_Base_Tag+1];
    UIView * view3 = [scrollView viewWithTag:L_Base_Tag+2];
    UIView * view4 = [scrollView viewWithTag:L_Base_Tag+3];
    
    UIImageView * imageView1 = (UIImageView *)[scrollView viewWithTag:L_Base_Tag*2];
    UIImageView * imageView2 = (UIImageView *)[scrollView viewWithTag:L_Base_Tag*2+1];
    UIImageView * imageView3 = (UIImageView *)[scrollView viewWithTag:L_Base_Tag*2+2];
    UIImageView * imageView4 = (UIImageView *)[scrollView viewWithTag:L_Base_Tag*2+3];
    
    CGFloat xOffset = scrollView.contentOffset.x;
    
    //根据偏移量旋转
    CGFloat rotateAngle = -1 * 1.0/L_SCREEN_WIDHT * xOffset * M_PI_2 * L_Rotate_Rate;
    view1.layer.transform = CATransform3DMakeRotation(rotateAngle, 0, 0, 1);
    view2.layer.transform = CATransform3DMakeRotation(M_PI_2*1+rotateAngle, 0, 0, 1);
    view3.layer.transform = CATransform3DMakeRotation(M_PI_2*2+rotateAngle, 0, 0, 1);
    view4.layer.transform = CATransform3DMakeRotation(M_PI_2*3+rotateAngle, 0, 0, 1);
    
    //根据偏移量位移（保证中心点始终都在屏幕下方中间）
    view1.center = CGPointMake(0.5 * L_SCREEN_WIDHT+xOffset, L_SCREEN_HEIGHT);
    view2.center = CGPointMake(0.5 * L_SCREEN_WIDHT+xOffset, L_SCREEN_HEIGHT);
    view3.center = CGPointMake(0.5 * L_SCREEN_WIDHT+xOffset, L_SCREEN_HEIGHT);
    view4.center = CGPointMake(0.5 * L_SCREEN_WIDHT+xOffset, L_SCREEN_HEIGHT);
    
    //当前哪个视图放在最上面
    if (xOffset<L_SCREEN_WIDHT*0.5) {
        [scrollView bringSubviewToFront:view1];
        
    }else if (xOffset>=L_SCREEN_WIDHT*0.5 && xOffset < L_SCREEN_WIDHT*1.5){
        [scrollView bringSubviewToFront:view2];
        
        
    }else if (xOffset >=L_SCREEN_WIDHT*1.5 && xOffset < L_SCREEN_WIDHT*2.5){
        [scrollView bringSubviewToFront:view3];
        
    }else if (xOffset >=L_SCREEN_WIDHT*2.5)
    {
        [scrollView bringSubviewToFront:view4];
        
    }
    
    //调节其透明度
    CGFloat xoffset_More = xOffset*1.5>L_SCREEN_WIDHT?L_SCREEN_WIDHT:xOffset*1.5;
    if (xOffset < L_SCREEN_WIDHT) {
        view1.alpha = (L_SCREEN_WIDHT - xoffset_More)/L_SCREEN_WIDHT;
        imageView1.alpha = (L_SCREEN_WIDHT - xOffset)/L_SCREEN_WIDHT;;
        
    }
    if (xOffset <= L_SCREEN_WIDHT) {
        view2.alpha = xoffset_More / L_SCREEN_WIDHT;
        imageView2.alpha = xOffset / L_SCREEN_WIDHT;
    }
    if (xOffset >L_SCREEN_WIDHT && xOffset <= L_SCREEN_WIDHT*2) {
        view2.alpha = (L_SCREEN_WIDHT*2 - xOffset)/L_SCREEN_WIDHT;
        view3.alpha = (xOffset - L_SCREEN_WIDHT)/ L_SCREEN_WIDHT;
        
        imageView2.alpha = (L_SCREEN_WIDHT*2 - xOffset)/L_SCREEN_WIDHT;
        imageView3.alpha = (xOffset - L_SCREEN_WIDHT)/ L_SCREEN_WIDHT;
    }
    if (xOffset >L_SCREEN_WIDHT*2 ) {
        view3.alpha = (L_SCREEN_WIDHT*3 - xOffset)/L_SCREEN_WIDHT;
        view4.alpha = (xOffset - L_SCREEN_WIDHT*2)/ L_SCREEN_WIDHT;
        
        imageView3.alpha = (L_SCREEN_WIDHT*3 - xOffset)/L_SCREEN_WIDHT;
        imageView4.alpha = (xOffset - L_SCREEN_WIDHT*2)/ L_SCREEN_WIDHT;
    }
    
    //调节背景色
    if (xOffset <L_SCREEN_WIDHT && xOffset>0) {
        self.backgroundColor = [UIColor colorWithRed:(140-40.0/L_SCREEN_WIDHT*xOffset)/255.0 green:(255-25.0/L_SCREEN_WIDHT*xOffset)/255.0 blue:(255-100.0/L_SCREEN_WIDHT*xOffset)/255.0 alpha:1];
        
    }else if (xOffset>=L_SCREEN_WIDHT &&xOffset<L_SCREEN_WIDHT*2){
        
        self.backgroundColor = [UIColor colorWithRed:(100+30.0/L_SCREEN_WIDHT*(xOffset-L_SCREEN_WIDHT))/255.0 green:(230-40.0/L_SCREEN_WIDHT*(xOffset-L_SCREEN_WIDHT))/255.0 blue:(155-5.0/320*(xOffset-L_SCREEN_WIDHT))/255.0 alpha:1];
        
    }else if (xOffset>=L_SCREEN_WIDHT*2 &&xOffset<L_SCREEN_WIDHT*3){
        
        self.backgroundColor = [UIColor colorWithRed:(130-50.0/L_SCREEN_WIDHT*(xOffset-L_SCREEN_WIDHT*2))/255.0 green:(190-40.0/L_SCREEN_WIDHT*(xOffset-L_SCREEN_WIDHT*2))/255.0 blue:(150+50.0/L_SCREEN_WIDHT*(xOffset-L_SCREEN_WIDHT*2))/255.0 alpha:1];
        
    }else if (xOffset>=L_SCREEN_WIDHT*3 &&xOffset<L_SCREEN_WIDHT*4){
        
        self.backgroundColor = [UIColor colorWithRed:(80-10.0/L_SCREEN_WIDHT*(xOffset-L_SCREEN_WIDHT*3))/255.0 green:(150-25.0/L_SCREEN_WIDHT*(xOffset-L_SCREEN_WIDHT*3))/255.0 blue:(200-90.0/L_SCREEN_WIDHT*(xOffset-L_SCREEN_WIDHT*3))/255.0 alpha:1];
    }
    
}

#pragma 按钮的点击方法
-(void)ClickToRemove
{
    NSLog(@"进入主界面");
}

@end