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增加下拉放大 #31

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增加下拉放大 #31

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30 changes: 21 additions & 9 deletions LTNavigationBar/BGColorDemoViewController.m
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@
#import "BGColorDemoViewController.h"
#import "UINavigationBar+Awesome.h"

#define NAVBAR_CHANGE_POINT 50
#define NAVBAR_CHANGE_POINT self.tableView.tableHeaderView.frame.size.height - self.tableView.contentInset.top * 2

@interface BGColorDemoViewController ()<UITableViewDataSource,UITableViewDelegate>
@property (weak, nonatomic) IBOutlet UITableView *tableView;
Expand All @@ -23,18 +23,30 @@ - (void)viewDidLoad {
self.tableView.dataSource = self;
[self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"Cell"];
[self.navigationController.navigationBar lt_setBackgroundColor:[UIColor clearColor]];
// 是否缩放变形
[self.tableView.tableHeaderView.subviews lastObject].contentMode = UIViewContentModeScaleAspectFill;
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
UIColor * color = [UIColor colorWithRed:0/255.0 green:175/255.0 blue:240/255.0 alpha:1];
CGFloat offsetY = scrollView.contentOffset.y;
if (offsetY > NAVBAR_CHANGE_POINT) {
CGFloat alpha = MIN(1, 1 - ((NAVBAR_CHANGE_POINT + 64 - offsetY) / 64));
[self.navigationController.navigationBar lt_setBackgroundColor:[color colorWithAlphaComponent:alpha]];
} else {
[self.navigationController.navigationBar lt_setBackgroundColor:[color colorWithAlphaComponent:0]];
}
UIColor * color = [UIColor colorWithRed:0/255.0 green:175/255.0 blue:240/255.0 alpha:1];
CGFloat offsetY = scrollView.contentOffset.y;
UIView *headerImage = [self.tableView.tableHeaderView.subviews lastObject];
if (offsetY > NAVBAR_CHANGE_POINT) { // 渐变色
CGFloat alpha = MIN(1, 1 - ((NAVBAR_CHANGE_POINT + 64 - offsetY) / 64));
[self.navigationController.navigationBar lt_setBackgroundColor:[color colorWithAlphaComponent:alpha]];
} else { // 纯色
[self.navigationController.navigationBar lt_setBackgroundColor:[color colorWithAlphaComponent:0]];
if (offsetY < - self.tableView.contentInset.top) { // 到顶了还下拉
// 缩放方式二：
// CGFloat scale = 1 - (offsetY + self.tableView.contentInset.top)/500;
// headerImage.transform = CGAffineTransformMakeScale(scale, scale);
CGRect frame = headerImage.frame;
frame.origin.y = offsetY;
frame.size.height = -offsetY + self.tableView.tableHeaderView.frame.size.height;
headerImage.frame = frame;
}
}
}

- (void)viewWillAppear:(BOOL)animated
Expand Down