固定UIScrollView滑动的方向

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固定UIScrollView滑动的方向

一般而言,我们通过这两个参数CGRectMake以及contentSize就可以自动的让UIScrollView只往一个方向滚动.但我遇到过非常奇葩的情况,那就是即使设置的CGRectMake以及contentSize没有一点点问题,这个UIScrollView也能够上下左右滚动-_-!!.

为了不依赖于CGRectMake以及contentSize,我们可以通过在代理方法scrollViewDidScroll:中进行限制即可.

没有限制之前的效果:

源码:

//
// RootViewController.m
// BUG
//
// Copyright (c) 2014年 Y.X. All rights reserved.
//#import "RootViewController.h"@interface RootViewController ()<UIScrollViewDelegate>{
UIScrollView *_showView;
}@end@implementation RootViewController- (void)viewDidLoad
{
[super viewDidLoad]; UIImageView *showImageView = \
[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"长图.jpg"]]; _showView = [[UIScrollView alloc] initWithFrame:CGRectMake(, , , )];
_showView.delegate = self;
[_showView addSubview:showImageView];
_showView.contentSize = showImageView.frame.size;
[self.view addSubview:_showView];
}- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGPoint point = scrollView.contentOffset;
// point.y = 0.f;
scrollView.contentOffset = point;
}@end

限制后效果:

//
// RootViewController.m
// BUG
//
// Copyright (c) 2014年 Y.X. All rights reserved.
//#import "RootViewController.h"@interface RootViewController ()<UIScrollViewDelegate>{
UIScrollView *_showView;
}@end@implementation RootViewController- (void)viewDidLoad
{
[super viewDidLoad]; UIImageView *showImageView = \
[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"长图.jpg"]]; _showView = [[UIScrollView alloc] initWithFrame:CGRectMake(, , , )];
_showView.delegate = self;
[_showView addSubview:showImageView];
_showView.contentSize = showImageView.frame.size;
[self.view addSubview:_showView];
}- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGPoint point = scrollView.contentOffset; // 限制y轴不动
point.y = .f; scrollView.contentOffset = point;
}@end