快速实现商品详情页上下滑动的动画效果
简单原理：创建一个headerBackview 作为 tableView 的 tableHeaderView 并实现：
[tableView insertSubview:self.headerBackview atIndex:0];
然后再-(void)scrollViewDidScroll:(UIScrollView *)scrollView的代理方法中实现相关视图frame 的变化
直接上代码
//// ViewController.m// ZQ_GoodsDetailAnimation//// Created by hzq on 2017/6/7.// Copyright © 2017年 zq. All rights reserved.//#import "ViewController.h"@interface ViewController ()@property(nonatomic,weak)UIView * headerBackview;
@property(nonatomic,weak)UIImageView * headerView;
@property(nonatomic,weak)UITableView * tableView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
UITableView * tableView = [[UITableView alloc]initWithFrame:self.view.bounds style:UITableViewStylePlain];
[self.view addSubview:tableView];
self.tableView = tableView;
tableView.delegate = self;
tableView.dataSource = self;
UIView * headerBackview = [[UIView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.width)];
self.headerBackview = headerBackview;
tableView.tableHeaderView= headerBackview;
UIImageView * headerView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.width)];
[headerBackview addSubview:headerView];
self.headerView = headerView;
headerView.image = [UIImage imageNamed:@"tooopen_sy_127457023651.jpeg"];
[tableView insertSubview:self.headerBackview atIndex:0];
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return 10;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString * cellIdentifier = @"cellIdentifier";
UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (!cell) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:cellIdentifier];
}
cell.backgroundColor = [UIColor cyanColor];
cell.textLabel.text = [NSString stringWithFormat:@"%ld",(long)indexPath.row];
return cell;
}
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
return 100;
}
#pragma mark - UIScrollViewDelegate
-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGFloat offset = scrollView.contentOffset.y;
CGRect frame = self.headerView.frame;
if (offset<0) {
frame.origin.y = offset;
frame.size.height = self.view.frame.size.width - offset;
frame.origin.x = offset/2;
frame.size.width = self.view.frame.size.width - offset;
}else{
frame.origin.y = offset/2;
}
self.headerView.frame = frame;
[self.tableView insertSubview:self.headerBackview atIndex:0];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
附上github链接：github.com/ZIQG/ZQ_GoodsDetailAnimation
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