IOS－UIScrollView

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// MainViewController.m

// UIScrollView

// Created by Lanou on 14-4-11.

//作业1:实现相册

//2.查询相关api，uiscrollview的bounces属性，让scrollview的滚动条消失，改变uipagecontrol的点的颜色，

//测试uitextfield的协议，实现如下效果：有两个textfield，点击第一个的时候键盘右下角为next，点击next后让光标显示在第二个textfieldB里面，并且键盘右下角为完成按钮，点击完成后收回键盘

//3.实现循环滚动相册。

#import "MainViewController.h"

@interface MainViewController ()

@end

@implementation MainViewController

-(void)dealloc{

[_scroll release];

_scroll = nil;

[_page release];

_page = nil;

[super dealloc];

}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

if (self) {

}

return self;

}

- (void)viewDidLoad

{

[super viewDidLoad];

// 建立UIScrollView对象

self.scroll = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 50, 320, 200)];

[_scroll setBackgroundColor:[UIColor blueColor]];

[_scroll setContentSize:CGSizeMake(320*6, 200)];

// 设置起始的位置

_scroll.contentOffset = CGPointMake(640, 0);

// 给这个类添加协议

_scroll.delegate = self;

// 设置放大缩小的倍数就是放大后停在哪个倍数

// [_scroll setMaximumZoomScale:2.0f];

// [_scroll setMinimumZoomScale:0.5f];

// 设置是否显示边框

// [_scroll setBounces:NO];

// 显示水平条－－－－－Horizontal

// [_scroll setShowsHorizontalScrollIndicator:NO];

// 显示垂直条－－－－－Vertical

// [_scroll setShowsVerticalScrollIndicator:NO];

// 把每一屏幕设置成一页一页

[_scroll setPagingEnabled:YES];

[self.view addSubview:_scroll];

[_scroll release];

for (int i = 0; i < 6; i++) {

// 在大的UIScrollView上添加一个个小的UIScrollView

UIScrollView * scr = [[UIScrollView alloc] initWithFrame:CGRectMake(320*i, 0, 320, 200)];

[scr setBackgroundColor:[UIColor blackColor]];

// 边框放大缩小可以不

// scr.bouncesZoom = NO;

[scr setMaximumZoomScale:2];

[scr setMinimumZoomScale:0.5];

scr.delegate = self;

[_scroll addSubview:scr];

[scr release];

// 在UIScrollView上田间UIImageView

NSString * str = [NSString stringWithFormat:@"%d",i+1];

UIImageView * image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:str]];

[image setFrame:CGRectMake(0,0, 320, 200)];

[scr addSubview:image];

[image release];

}

// 添加UIPageController

self.page = [[UIPageControl alloc] initWithFrame:CGRectMake(0, 270, 320, 40)];

[_page setBackgroundColor:[UIColor redColor]];

// 设置几页面

[_page setNumberOfPages:6];

[_page setPageIndicatorTintColor:[UIColor yellowColor]];

[_page setCurrentPageIndicatorTintColor:[UIColor blackColor]];

// 添加点击事件

[_page addTarget:self action:@selector(pageAction:) forControlEvents:UIControlEventValueChanged];

// 初始化page的位置为当前页面

[_page setCurrentPage:_scroll.contentOffset.x/320];

[self.view addSubview:_page];

[_page release];

}

// 标记代码用途

#pragma mark -

#pragma mark pageControl action

-(void)pageAction:(id)sender{

if ([sender isKindOfClass:[UIPageControl class]]) {

// UIPageControl *page = (UIPageControl *)sender;

// 取得当前页数并转换为ContentOffset 显示到这个位置

[_scroll setContentOffset:CGPointMake(_page.currentPage*320, 0)];

}

#pragma mark -

#pragma mark scrollview delegate

-(void)scrollViewDidScroll:(UIScrollView *)scrollView{

// NSLog(@"%@",scrollView);

// 结构体的打印方法

NSLog(@"content off set == %@",NSStringFromCGPoint(scrollView.contentOffset));

// 从偏移量取得显示的页码

[_page setCurrentPage:_scroll.contentOffset.x/320];

}

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{

// 重新设定上面小的UIScrollView的图片的伸缩

for (UIScrollView * s in scrollView.subviews) {

if ([s isKindOfClass:[UIScrollView class]]) {

[s setZoomScale:1];

}

// 改变scrollView的大小

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{

// 取得scrollView上的image

NSArray * arr = [scrollView subviews];

return [arr objectAtIndex:0];

}

@end

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