1.QQ動態(tài)界面隱藏了navigation bar 和statusbar
2.附上代碼
//? FiveViewController.h//? iOS_導航透明度變化實現(xiàn)////? Created by 密碼123 on 16/12/15.//? Copyright ? 2016年 高宇. All rights reserved.//#import@interface FiveViewController : UIViewController
@end
/**********************/
////? FiveViewController.m//? iOS_導航透明度變化實現(xiàn)////? Created by 密碼123 on 16/12/15.//? Copyright ? 2016年 高宇. All rights reserved.//#define SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width#define SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height#import "FiveViewController.h"@interface FiveViewController ()@property (strong, nonatomic) UITableView *tableView;
@property (strong, nonatomic) UIView *barView;
@property (strong, nonatomic) UIButton *addBtn;
@end
@implementation FiveViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor=[UIColor whiteColor];
self.navigationController.navigationBarHidden=YES;
[[UIApplication sharedApplication]setStatusBarHidden:YES];
[self.view addSubview:self.tableView];
[self.view addSubview:self.barView];
[self.barView addSubview:self.addBtn];
}
- (UITableView *)tableView
{
if (!_tableView) {
_tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT) style:UITableViewStyleGrouped];
_tableView.delegate = self;
_tableView.dataSource = self;
_tableView.tableFooterView = nil;
_tableView.backgroundColor = [UIColor whiteColor];
}
return _tableView;
}
-(UIView *)barView
{
if (!_barView)
{
_barView=[[UIView alloc]initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, 64)];
}
return _barView;
}
-(UIButton *)addBtn
{
if (!_addBtn) {
_addBtn=[UIButton buttonWithType:UIButtonTypeCustom];
_addBtn.frame=CGRectMake(SCREEN_WIDTH-60, 10, 50, 44);
[_addBtn setTitle:@"添加" forState:UIControlStateNormal];
[_addBtn addTarget:self action:@selector(addBtnAction:) forControlEvents:UIControlEventTouchUpInside];
}
return _addBtn;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark? - tableViewDelegate代理方法
- (NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 30;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *rid=@"cell";
UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:rid];
if(cell==nil){
cell=[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:rid];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.contentView.backgroundColor = [UIColor purpleColor];
}
cell.textLabel.text = [NSString stringWithFormat:@"tableView的第%ld個cell",indexPath.row];
return cell;
}
- (CGFloat) tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
return 0.00000001;
}
- (CGFloat) tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
return 0.000000001;
}
- (void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self.navigationController popViewControllerAnimated:YES];
}
#pragma mark? - scrollViewDelegate代理方法
-(BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView
{
NSLog(@"scrollview---%f",scrollView.contentOffset.y);
return YES;
}
-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
UIColor *color = [UIColor colorWithRed:26.0/255 green:167.0/255 blue:244.0/255 alpha:1.0];
CGFloat offsetY = scrollView.contentOffset.y;
if (offsetY>=200.0)
{
self.addBtn.backgroundColor=[UIColor whiteColor];
[self.addBtn setTitleColor:color forState:UIControlStateNormal];
}
else
{
[self.addBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
self.addBtn.backgroundColor=[UIColor clearColor];
}
NSLog(@"----? %f--",offsetY);
if (offsetY > 0)
{
CGFloat alpha = 1 - ((200 - offsetY) / 200);
//? ? ? ? self.navigationController.navigationBar.backgroundColor = [color colorWithAlphaComponent:alpha];
//? ? ? ? self.navigationController.navigationBar.tintColor=[color colorWithAlphaComponent:alpha];
self.barView.backgroundColor=[color colorWithAlphaComponent:alpha];
}
else
{
//? ? ? ? //? ? ? ? self.navBar.backgroundColor = [color colorWithAlphaComponent:0];
//? ? ? ? self.navigationController.navigationBar.backgroundColor = [UIColor clearColor];
self.barView.backgroundColor=[color colorWithAlphaComponent:0];
}
//讓tableview拖動一段距離就不能拖動
if (offsetY<=-100) {
//? ? ? ? self.tableView.scrollEnabled=NO;
[self.tableView setContentOffset:CGPointMake(0, -100)];
}
}
#pragma mark - 點擊事件
-(void)addBtnAction:(id)sender
{
NSLog(@"addBtnAction");
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
@end
3.其他漸變效果
