我在程序开发时发现,将UINavigationController+UIScrollView组合起来使用时,我将UIImageView放入UIScrollView时,UIImageView并不是按照我预想的那样,以UIScrollView的顶点作为视图添加的位置,这是由于UINavigationController在添加了导航栏以后,将会以导航栏下方作为UIScrollView的原点位置,有时候我们想完全显示该视图的内容,解决方法,看下面这个程序
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#import "RootViewController.h"
@interface RootViewController ()
@property (retain,nonatomic,readwrite)UIScrollView * scrollView;
@end
@implementation RootViewController
#define HIGHTOFNVBAR 64
#define HIGHTOFTOOLBAR 44
- (instancetype)init
{
self = [super init];
if (self) {
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self.navigationController setNavigationBarHidden:NO animated:NO];
[self.navigationController setToolbarHidden:NO animated:NO];
self.view.backgroundColor = [UIColor blackColor];
_scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];
_scrollView.contentSize = CGSizeMake(960, 0);
_scrollView.backgroundColor = [UIColor redColor];
[self.view addSubview:_scrollView];
UITapGestureRecognizer * tapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tap:)];
[_scrollView addGestureRecognizer:tapGesture];
_scrollView.pagingEnabled = YES;
_scrollView.userInteractionEnabled = YES;
_scrollView.showsHorizontalScrollIndicator = NO;
_scrollView.showsVerticalScrollIndicator = NO;
UIImageView *p_w_picpathView1 = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];
UIImageView *p_w_picpathView2 = [[UIImageView alloc]initWithFrame:CGRectMake(320, 0, 320, 480)];
UIImageView *p_w_picpathView3 = [[UIImageView alloc]initWithFrame:CGRectMake(640, 0, 320, 480)];
p_w_picpathView1.p_w_picpath = [UIImage p_w_picpathNamed:@"IMG_0242.JPG"];
p_w_picpathView2.p_w_picpath = [UIImage p_w_picpathNamed:@"IMG_0243.JPG"];
p_w_picpathView3.p_w_picpath = [UIImage p_w_picpathNamed:@"IMG_0244.JPG"];
_scrollView.contentInset = UIEdgeInsetsMake(-HIGHTOFNVBAR, 0, 0, 0);
self.navigationController.toolbar.translucent = YES;
self.navigationController.navigationBar.translucent = YES;
_scrollView.delegate = self;
NSLog(@"%@",NSStringFromCGRect(p_w_picpathView2.frame));
[_scrollView addSubview:p_w_picpathView1];
[_scrollView addSubview:p_w_picpathView2];
[_scrollView addSubview:p_w_picpathView3];
}
- (void)tap:(UITapGestureRecognizer *)tap
{
static int i = 0;
if (i%2 == 0) {
[self.navigationController setNavigationBarHidden:YES animated:YES];
[self.navigationController setToolbarHidden:YES animated:YES];
_scrollView.contentInset = UIEdgeInsetsMake(0, 0, HIGHTOFTOOLBAR, 0);
}
else
{
[self.navigationController setNavigationBarHidden:NO animated:YES];
[self.navigationController setToolbarHidden:NO animated:YES];
_scrollView.contentInset = UIEdgeInsetsMake(0, 0, -HIGHTOFTOOLBAR, 0);
}
i++;
}使用UIScrollerView的contentInset属性对UIScrollerView进行扩展即可
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