延迟以及 tableview 悬浮按钮

延迟设置

[self performSelector:@selector(createButton) withObject:nil afterDelay:1];

tableview 悬浮按钮 

#import "TabVc.h"

@interface TabVc ()

{

UIView *_aview;

}

@end

@implementation TabVc

- (void)viewDidLoad {

[super viewDidLoad];

self.tableView.backgroundColor = [UIColor whiteColor];

_aview = [[UIView alloc]initWithFrame:CGRectMake(100, 300, 50, 50)];

_aview.layer.cornerRadius = 25;

_aview.layer.masksToBounds = YES;

_aview.backgroundColor = [UIColor redColor];

[self.tableView addSubview:_aview];

}

-(void)scrollViewDidScroll:(UIScrollView *)scrollView {

_aview.frame = CGRectMake(100, 300+scrollView.contentOffset.y, 50, 50);

}