iOS-UITableView-实现下拉头部缩放效果

#import "ViewController.h" #define kOPHEIGHT 247 // 核心尺寸参数，强烈建议跟原背景图的高度一致 @interface ViewController ()<UITableViewDelegate> @property(nonatomic,strong) UIView * tableHeadView; @property(nonatomic,strong) UITableView * tableView; @end

 

@implementation HNOtherPeopleViewController - (void)viewDidLoad { [super viewDidLoad]; [self initTabelHeadView]; [self initTableView]; } -(void)initTableView{ _tableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, UIScreen.mainScreen.bounds.size.width, UIScreen.mainScreen.bounds.size.height)]; _tableView.delegate = self; [self.view addSubview:_tableView]; self.tableView.contentInset = UIEdgeInsetsMake(kOPHEIGHT, 0, 0, 0);//向上偏移 [self.tableView addSubview:_tableHeadView]; }

 

-(void)initTabelHeadView{ _tableHeadView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, UIScreen.mainScreen.bounds.size.width, kOPHEIGHT)]; //背景图 UIImageView*imgTableHeadViewBg= [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, UIScreen.mainScreen.bounds.size.width, kOPHEIGHT)]; imgTableHeadViewBg.image= [UIImage imageNamed:@"背景1"]; imgTableHeadViewBg.tag = 201; imgTableHeadViewBg.contentMode = UIViewContentModeScaleAspectFill; [_tableHeadView addSubview:imgTableHeadViewBg]; }

 

#pragma mark UITableViewDelegate //头部视图放大效果，及titleView透明度效果 -(void)scrollViewDidScroll:(UIScrollView *)scrollView{ CGPoint point = scrollView.contentOffset; if (point.y < -kOPHEIGHT) { CGRect rect = [_tableHeadView viewWithTag:201].frame; rect.origin.y = point.y; rect.size.height = -point.y; [_tableHeadView viewWithTag:201].frame = rect; } } @end