#import "TableCell.h"
#define SCR_WIDTH [UIScreen mainScreen].bounds.size.width
@interface FMHomeViewController ()<UITableViewDelegate,UITableViewDataSource>
@property (strong, nonatomic) IBOutlet UITableView *mainTableView;
@property (strong, nonatomic) UIImageView *topImgV;
@property (nonatomic, assign) CGFloat alphaMemory;
@end
@implementation FMHomeViewController
static NSString *const Identfier=@"TableCellID";
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
UIView *headerView=[[UIView alloc] initWithFrame:CGRectMake(0, 0, SCR_WIDTH, 300)];
headerView.backgroundColor=[UIColor clearColor];
self.mainTableView.tableHeaderView=headerView;
self.topImgV=[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, SCR_WIDTH, 300)];
self.topImgV.image=[UIImage imageNamed:@"meinv"];
[self.view insertSubview:self.topImgV belowSubview:self.mainTableView];
self.topImgV.contentMode=UIViewContentModeScaleAspectFill;
self.topImgV.clipsToBounds=YES;
[self.navigationController.navigationBar setBarTintColor:[UIColor colorWithRed:37.0/255 green:180.0/255 blue:237.0/255 alpha:1]];
// self.navigationController.navigationBar.hidden=YES;
}
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[[[self.navigationController.navigationBar subviews] objectAtIndex:0] setAlpha:_alphaMemory];
if (_alphaMemory == 0) {
self.navigationController.navigationBar.tintColor = [UIColor whiteColor];
}
else {
self.navigationController.navigationBar.tintColor = [UIColor blackColor];
}
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 20;
}
-(CGFloat )tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 60;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
TableCell *cell=[tableView dequeueReusableCellWithIdentifier:Identfier forIndexPath:indexPath];
return cell;
}
//MARK: tableView delegate
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
NSLog(@"%.f",_mainTableView.contentOffset.y);
CGFloat offsetY = scrollView.contentOffset.y;
CGRect frame=self.topImgV.frame;
if (offsetY>=0) {
frame.origin.y=-offsetY;
//重新賦值 frame
self.topImgV.frame=frame;
if (offsetY<=300) {
self.navigationController.navigationBar.tintColor = [UIColor blackColor];
_alphaMemory = offsetY/(300) >= 1 ? 1 : offsetY/(300);
[[[self.navigationController.navigationBar subviews] objectAtIndex:0] setAlpha:_alphaMemory];
}else if (offsetY>300){
_alphaMemory = 1;
[[[self.navigationController.navigationBar subviews] objectAtIndex:0] setAlpha:1];
}
}else{
_topImgV.transform = CGAffineTransformMakeScale(1 + offsetY/(-300), 1 + offsetY/(-300));
CGRect frame1=self.topImgV.frame;
frame1.origin.y = 0;
self.topImgV.frame=frame1;
}
}