固定UIScrollView滑动的方向

本文主要是介绍固定UIScrollView滑动的方向，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

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(0, 50, 320, 100)];_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(0, 50, 320, 100)];_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 = 0.f;scrollView.contentOffset = point;
}@end