都在代码里，直接上代码
//改变tableView的内边距
self.tableView.contentInset = UIEdgeInsetsMake(200, 0, 0, 0);
//这里创建的视图Y和高没有卵用，希望知道的同志告知一下
self.headerView = [[UIView alloc] initWithFrame:CGRectMake(0, -200, self.view.frame.size.width, 0)];
self.headerView.backgroundColor = [[UIColor redColor] colorWithAlphaComponent:.8];
//在这里创建的视图一定要添加到tableView上，而不是给头视图赋值
[self.tableView addSubview:self.headerView];
*****
想要宽高等比例缩放加上这句代码
self.headerView.contentMode = UIViewContentModeScaleToFill;
在scrollView代理方法里实现视图大小的改变
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
CGFloat yOffset = scrollView.contentOffset.y;
if (yOffset < -200) {
CGRect f = self.headerView.frame;
f.origin.y = yOffset;
f.size.height = -yOffset;
self.headerView.frame = f;
}
}
仿支付宝的刷新简陋版
#import "ViewController.h"
#import "MJRefresh.h"
@interface ViewController ()<UITableViewDelegate,UITableViewDataSource>
@property(strong,nonatomic)UITableView *rootTableView;
@property(strong,nonatomic)UIView *topView;
@property(strong,nonnull)UIView *backView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor grayColor];
[self.view addSubview:self.rootTableView];
[self.view addSubview:self.topView];
}
//懒加载tabbleView
-(UITableView *)rootTableView{
if (!_rootTableView) {
_rootTableView = [[UITableView alloc] initWithFrame:self.view.frame];
//设置代理
_rootTableView.delegate = self;
_rootTableView.dataSource = self;
_rootTableView.scrollIndicatorInsets = UIEdgeInsetsMake(200, 0, 0, 0);
_rootTableView.contentInset = UIEdgeInsetsMake(200, 0, 0, 0);
MJRefreshNormalHeader *header = [MJRefreshNormalHeader headerWithRefreshingBlock:^{
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[_rootTableView.mj_header endRefreshing];
});
}];
_rootTableView.mj_header = header;
}
return _rootTableView;
}
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
CGFloat offsetY = scrollView.contentOffset.y;
NSLog(@"%f",offsetY);
if (offsetY <= -263) {
//
self.topView.frame = CGRectMake(0, 64, [UIScreen mainScreen].bounds.size.width, 200);
}
if (offsetY > -263){
self.topView.frame = CGRectMake(0, -offsetY - 200 , [UIScreen mainScreen].bounds.size.width, 200);
}
}
-(UIView *)topView{
if (!_topView) {
_topView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, 200)];
_topView.backgroundColor = [[UIColor redColor] colorWithAlphaComponent:.3];
}
return _topView;
}
#pragma make 代理方法
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
return 1;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return 20;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell = [UITableViewCell new];
cell.textLabel.text = [NSString stringWithFormat:@"%ld",(long)indexPath.row];
return cell;
}
@end
