如果直接在TableVIewController上贴Button的话会导致这个会随之滚动,下面解决在TableView上实现位置固定悬浮按钮的两种方法:
1.在view上贴tableView,然后将悬浮按钮贴在view的最顶层
2.使用window
首先看一下最终的效果,在tableViewController上添加一个悬浮按钮,该按钮不能随着视图的滚动而滚动
首先介绍上面的第一种方法:
1)创建tableview和底部按钮的属性
//屏幕宽#define kScreenW [UIScreen mainScreen].bounds.size.width//屏幕高#define kScreenH [UIScreen mainScreen].bounds.size.height@interface broadcastLiveViewController ()<UITableViewDataSource, UITableViewDelegate>@property(nonatomic) UITableView *livesListTable;@property(nonatomic) UIButton *bottomButton;@end
2)创建属性到最顶部
@implementation broadcastLiveViewController- (void)viewDidLoad {[super viewDidLoad]; CGRect clientRect = [UIScreen mainScreen].bounds; _livesListTable = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, clientRect.size.width, clientRect.size.height-65) style:UITableViewStylePlain];[self.view addSubview:_livesListTable];_livesListTable.delegate = self;_livesListTable.dataSource = self; self.bottomButton = [UIButton buttonWithType:UIButtonTypeCustom];self.bottomButton.frame = CGRectMake(kScreenW - 80, kScreenH - 140, 60, 60);[self.bottomButton setBackgroundImage:[UIImage imageNamed:@"recordLive"] forState:UIControlStateNormal];[self.bottomButton addTarget:self action:@selector(onTapLiveBtn) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:self.bottomButton];
3)实现按钮事件
- (void)onTapLiveBtn{NSLog(@"点击底部按钮");}
接下来介绍第二种方法:
1)创建一个window,button属性避免window被释放
//屏幕宽#define kScreenW [UIScreen mainScreen].bounds.size.width//屏幕高#define kScreenH [UIScreen mainScreen].bounds.size.height@interface broadcastLiveViewController ()<UITableViewDataSource, UITableViewDelegate>@property(strong,nonatomic)UIWindow *window;@property(strong,nonatomic)UIButton *button;@end
2)创建window和button
默认的情况下系统只有一个window这时我们需要设置windowLevel
window不用添加在任何视图上
- (void)createButton{_button = [UIButton buttonWithType:UIButtonTypeCustom];[_button setBackgroundImage:[UIImage imageNamed:@"recordLive"] forState:UIControlStateNormal];_button.frame = CGRectMake(0, 0, 60, 60);[_button addTarget:self action:@selector(onTapLiveBtn) forControlEvents:UIControlEventTouchUpInside];_window = [[UIWindow alloc]initWithFrame: CGRectMake(kScreenW - 80, kScreenH - 80, 60, 60);];_window.windowLevel = UIWindowLevelAlert+1;_window.backgroundColor = [UIColor redColor];_window.layer.cornerRadius = 30;_window.layer.masksToBounds = YES;[_window addSubview:_button];[_window makeKeyAndVisible];//关键语句,显示window}
3)延时加载window,注意我们需要在rootWindow创建完成之后再创建这个悬浮的按钮
- (void)viewDidLoad {[super viewDidLoad];[self performSelector:@selector(createButton) withObject:nil afterDelay:1]; }
4)实现按钮事件
- (void)onTapLiveBtn{NSLog(@"点击底部按钮");}
注意::最后再添加一个小功能,使tableview上下滑动的时候,按钮动画效果的出现和消失,在这里是上拉消失,下拽出现
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{if (scrollView.contentOffset.y > self.offsetY && scrollView.contentOffset.y > 0) {//向上滑动//按钮消失[UIView transitionWithView:self.bottomButton duration:0.1 options:UIViewAnimationOptionTransitionNone animations:^{self.bottomButton.frame = CGRectMake(kScreenW - 80, kScreenH - 65, 60, 60);} completion:NULL]; }else if (scrollView.contentOffset.y < self.offsetY ){//向下滑动//按钮出现[UIView transitionWithView:self.bottomButton duration:0.1 options:UIViewAnimationOptionTransitionNone animations:^{self.bottomButton.frame = CGRectMake(kScreenW - 80, kScreenH - 140, 60, 60);} completion:NULL];}self.offsetY = scrollView.contentOffset.y;//将当前位移变成缓存位移}
以上所述是小编给大家介绍的Android开发中在TableView上添加悬浮按钮的方法,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对武林网网站的支持!
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