//
//ViewController.m
//下拉方法
//
//Created by lixiang on 16/8/30.
//Copyright © 2016年lixiang. All rights reserved.
//
#import"ViewController.h"
constCGFloattopViewH=350;
@interfaceViewController()
@property(nonatomic,weak)UIImageView* topv;
@end
@implementationViewController
- (void)viewDidLoad {
[superviewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//设置内边距（让cell往下移动一段距离）
self.tableView.contentInset=UIEdgeInsetsMake(topViewH/2,0,0,0);
UIImageView* topImgV=[[UIImageViewalloc]init];
topImgV.image=[UIImageimageNamed:@"test"];
topImgV.frame=CGRectMake(0, -topViewH,self.view.frame.size.width,topViewH);
topImgV.contentMode=UIViewContentModeScaleAspectFill;
[self.tableViewinsertSubview:topImgVatIndex:0];
self.topv=topImgV;
}
#pragma mark -数据源方法
-(NSInteger)tableView:(UITableView*)tableView numberOfRowsInSection:(NSInteger)section
{
return20;
}
-(UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath
{
staticNSString* ID=@"cell";
UITableViewCell* cell=[tableViewdequeueReusableCellWithIdentifier:ID];
if(!cell) {
cell=[[UITableViewCellalloc]initWithStyle:UITableViewCellStyleSubtitlereuseIdentifier:ID
];
}
cell.textLabel.text=[NSStringstringWithFormat:@"test数据---%ld",indexPath.row];
returncell;
}
-(void)scrollViewDidScroll:(UIScrollView*)scrollView
{
NSLog(@"向下拉了多少=====%f",-topViewH/2-scrollView.contentOffset.y);
//向下拉了多少
CGFloatdown=-150-scrollView.contentOffset.y;
if(down<0) {
return;
}
CGRectframe=self.topv.frame;
frame.size.height=topViewH+down*0.5;//*3(决定图片变大的速度值越大速度越快)
self.topv.frame=frame;
}
- (void)didReceiveMemoryWarning {
[superdidReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
