.m文件中实现的代码如下：
import "YHBaseHeaderAnimatedViewController.h"
@interface YHBaseHeaderAnimatedViewController ()
{
//承载视图
UIView * _privteBGHeaderView;
//宽高比例
CGFloat _privteRate;
//原始宽高
CGFloat _privteOriWidth;
CGFloat _privteOriHeught;
UIVisualEffectView * _blurView;
UINavigationBar * _naviBar;}
@end
@implementation YHBaseHeaderAnimatedViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
self.edgesForExtendedLayout = UIRectEdgeNone;
_tableView = [[UITableView alloc]initWithFrame:self.view.frame style:UITableViewStylePlain];
[self.view addSubview:_tableView];
_tableView.delegate=self;
_tableView.dataSource=self;
[self YHCreatView];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//对导航进行处理
-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
if (self.navigationController) {
[self.navigationController setNavigationBarHidden:YES animated:YES];
[self showNavigationBar];
}}
-(void)viewWillDisappear:(BOOL)animated{
[super viewWillDisappear:animated];
if (self.navigationController) {
[self.navigationController setNavigationBarHidden:NO animated:YES];
}}
-(void)showNavigationBar{
if (_naviBar==nil) {
_naviBar = [[UINavigationBar alloc]init];
[self.view addSubview:_naviBar];
_naviBar.frame = CGRectMake(0, 0, self.view.frame.size.width, 64);
[_naviBar setBackgroundImage:[UIImage imageNamed:@"clear"] forBarMetrics:UIBarMetricsDefault];
[_naviBar setShadowImage:[UIImage imageNamed:@"clear"]];
_naviBar.backgroundColor = [UIColor colorWithRed:1 green:1 blue:1 alpha:0];
UINavigationItem * item = [[UINavigationItem alloc]initWithTitle:self.title];
_naviBar.items = @[item];
item.leftBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"返回" style:UIBarButtonItemStyleDone target:self action:@selector(popToLast)];
}
if (self.animatedHeaderView==nil) {
_naviBar.hidden=YES;
}else{
_naviBar.hidden=NO;
}}
-(void)popToLast{
[self.navigationController popViewControllerAnimated:YES];}
-(void)YHCreatView{
if (self.maxScrollOffset==0) {
self.maxScrollOffset=40;
}
if (self.minAlpha==0) {
self.minAlpha = 0.5;
}
if (self.maxBluer==0) {
self.maxBluer = 1;
}
_privteBGHeaderView = [[UIView alloc]init];
_privteBGHeaderView.backgroundColor = [UIColor clearColor];
self.tableView.backgroundColor = [UIColor clearColor];
_blurView = [[UIVisualEffectView alloc]initWithEffect:[UIBlurEffect effectWithStyle:UIBlurEffectStyleLight]];
[self reloadAnimatedView];}
-(void)reloadAnimatedView{
CGFloat viewH=0;
CGFloat aniH=0;
for (UIView * view in _privteBGHeaderView.subviews) {
[view removeFromSuperview];
}
if (self.tableHeaderView) {
viewH = viewH+self.tableHeaderView.bounds.size.height;
[_privteBGHeaderView addSubview:self.tableHeaderView];
}
if (self.animatedHeaderView) {
_privteRate = self.animatedHeaderView.frame.size.width/self.animatedHeaderView.frame.size.height;
[self.animatedHeaderView addSubview:_blurView];
_blurView.frame= self.animatedHeaderView.bounds;
_blurView.alpha=0;
_privteOriWidth = self.animatedHeaderView.frame.size.width;
_privteOriHeught = self.animatedHeaderView.frame.size.height;
if (self.headerHeight!=0) {
viewH+=self.headerHeight;
aniH = self.headerHeight;
}else{
viewH+=self.view.frame.size.width/self.animatedHeaderView.bounds.size.width*self.animatedHeaderView.frame.size.height;
aniH = self.animatedHeaderView.bounds.size.height;
}
[self.view insertSubview:self.animatedHeaderView atIndex:0];
}
self.tableHeaderView.frame=CGRectMake(0, aniH, self.tableHeaderView.frame.size.width, self.tableHeaderView.frame.size.height);
_privteBGHeaderView.frame=CGRectMake(0, 0, self.view.frame.size.width, viewH);
self.tableView.tableHeaderView = _privteBGHeaderView;}
-(void)setAnimatedHeaderView:(UIView *)animatedHeaderView{
if (animatedHeaderView==nil) {
if (_animatedHeaderView) {
[_animatedHeaderView removeFromSuperview];
}
}
_animatedHeaderView = animatedHeaderView;
}
-(void)setMinAlpha:(CGFloat)minAlpha{
if (minAlpha<=0) {
minAlpha=0.001;
}
if (minAlpha>=1) {
minAlpha=0.999;
}
_minAlpha=minAlpha;}
-(void)setMaxBluer:(CGFloat)maxBluer{
if (maxBluer<=0) {
maxBluer = 0.001;
}
if (maxBluer>=1) {
maxBluer = 0.999;
}
_maxBluer = maxBluer;}
-(void)setNaviColor:(UIColor *)naviColor{
_naviColor = naviColor;
_naviBar.backgroundColor = naviColor;}
-(void)setLeftBarButtons:(NSArray *)leftBarButtons{
_naviBar.topItem.leftBarButtonItems = leftBarButtons;
_leftBarButtons = leftBarButtons;}
-(void)setRightBarButtons:(NSArray *)rightBarButtons{
_naviBar.topItem.rightBarButtonItems = rightBarButtons;
_rightBarButtons = rightBarButtons;}
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
if (self.animatedHeaderView==nil) {
return;
}
if (self.tableView==scrollView) {
//获取到偏移量 默认两倍
CGFloat offset = scrollView.contentOffset.y*2;
//如果小于0 则进行形变拉伸操作
if (offset<=0) {
if (offset<-self.maxScrollOffset*2) {
}else{
CGFloat height = _privteOriHeught+abs((int)offset);
CGFloat width = height*_privteRate;
self.animatedHeaderView.frame = CGRectMake(self.view.frame.size.width/2-width/2, offset/2, width, height);
}
if (_naviBar) {
if (_naviBar.shadowImage==nil) {
[_naviBar setShadowImage:[UIImage imageNamed:@"clear"]];
}
}
}else{
//如果大于零 进行推出操作
if (self.animatedlevel==YHBaseHeaderAnimatedLevelSlow) {
//慢速
self.animatedHeaderView.frame = CGRectMake(0, -offset/8, self.animatedHeaderView.frame.size.width, self.animatedHeaderView.frame.size.height);
}else if(self.animatedlevel==YHBaseHeaderAnimatedLevelFast){
//快速
self.animatedHeaderView.frame = CGRectMake(0, -offset/2, self.animatedHeaderView.frame.size.width, self.animatedHeaderView.frame.size.height);
}else{
//正常
self.animatedHeaderView.frame = CGRectMake(0, -offset/4, self.animatedHeaderView.frame.size.width, self.animatedHeaderView.frame.size.height);
}
//进行渐隐动画处理
CGFloat tmp = offset/2/_privteOriHeught;
if (self.alphaAnimated) {
self.animatedHeaderView.alpha = 1-(1-self.minAlpha)*tmp;
}
//进行模糊动画
if (self.bluerAnimated) {
_blurView.alpha = self.maxBluer*tmp;
}
//进行导航显示
if (_naviBar) {
_naviBar.backgroundColor = [_naviBar.backgroundColor colorWithAlphaComponent:tmp];
if (_naviBar.shadowImage) {
[_naviBar setShadowImage:nil];
}
}
}
}}
@end
在使用时，创建一个视图控制器继承于它，在其viewDidLoad方法中进行一些简单的设置即可，如下：
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
//设置头图
UIImageView * imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 200)];
imageView.image = [UIImage imageNamed:@"image"];
self.animatedHeaderView = imageView;
//设置tableView的头视图
UILabel * label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 30)];
label.backgroundColor = [UIColor purpleColor];
label.textColor = [UIColor whiteColor];
label.textAlignment =NSTextAlignmentCenter;
label.text = @"下面进行功能演示";
self.tableHeaderView = label;
[self reloadAnimatedView];
}
我写了一个完整的演示Demo，Demo中有完整的功能演示，需要的朋友可以自行下载：http://pan.baidu.com/s/1c1VKT00。
