uiscrollview-big Picture Show and picture Zoom Demo

A big Picture Show

#import "MJViewController.h"

@interface Mjviewcontroller ()

{

Uiscrollview *_scrollview;//side But global calls are defined as member variables

}

@end

@implementation Mjviewcontroller

-(void) viewdidload

{

[Super Viewdidload];

1. Create Uiscrollview

Uiscrollview *scrollview = [[Uiscrollview alloc] init];

Scrollview.frame = CGRectMake (0, 0, 250, 250); Size in frame refers to the visual range of the Uiscrollview

Scrollview.backgroundcolor = [Uicolor Graycolor];

[Self.view Addsubview:scrollview];

2. Create Uiimageview (image)

Uiimageview *imageview = [[Uiimageview alloc] init];

Imageview.image = [UIImage imagenamed:@ "big.jpg"];

CGFloat IMGW = imageView.image.size.width; The width of the picture

CGFloat imgh = imageView.image.size.height; The height of the picture

Imageview.frame = CGRectMake (0, 0, IMGW, IMGH);

[ScrollView Addsubview:imageview];

3. Setting the properties of the ScrollView

Sets the scrolling range (content size) of the Uiscrollview

Scrollview.contentsize = imageView.image.size;

Hide Horizontal scroll bar

Scrollview.showshorizontalscrollindicator = NO;

Scrollview.showsverticalscrollindicator = NO;

Used to record the location of ScrollView scrolling

Scrollview.contentoffset =;

Remove the Spring effect

Scrollview.bounces = NO;

Add extra scrolling Area

Top left bottom Right

Scrollview.contentinset = Uiedgeinsetsmake (20, 20, 20, 20);

_scrollview = ScrollView;

}

-(Ibaction) Down: (UIButton *) Sender {

[UIView animatewithduration:1.0 animations:^{

This method controls the scrolling effect of the button under the body, here is the Y value of changing the _scrollview.contentoffset

Cgpoint offset = _scrollview.contentoffset;

Offset.y + = 150;

_scrollview.contentoffset = offset;

_scrollview.contentoffset = cgpointmake (0, 0);

}];

}

@end

Two picture zoom

//

Mjviewcontroller.m

02-uiscrollview02-Picture Zoom

//

Created by Apple on 13-11-27.

Copyright (c) 2013 itcast. All rights reserved.

//

#import "MJViewController.h"

@interface Mjviewcontroller () <UIScrollViewDelegate>

{

Uiimageview *_imageview;

}

@end

@implementation Mjviewcontroller

-(void) viewdidload

{

[Super Viewdidload];

1. Add Uiscrollview

Uiscrollview *scrollview = [[Uiscrollview alloc] init];

Scrollview.frame = CGRectMake (0, 0, 320, 460);

Scrollview.frame = Self.view.bounds;

[Self.view Addsubview:scrollview];

2. Add a picture

UIImage *image = [UIImage imagenamed:@ "big.jpg"];

Call Initwithimage: Method created by the Uiimageview, its width is the same as the width of the picture is the same as the height

_imageview = [[Uiimageview alloc] initwithimage:image];

Set up a picture

Imageview.image = [UIImage imagenamed:@ "big.jpg"];

//

Set frame

Imageview.frame = CGRectMake (0, 0, imageView.image.size.width, imageView.image.size.height);

[ScrollView Addsubview:_imageview];

Set Content Scope

Scrollview.contentsize = image.size;

Set proxy objects for ScrollView

Scrollview.delegate = self;

Set Maximum scaling ratio

Scrollview.maximumzoomscale = 2.0;

Set the minimum scaling scale

Scrollview.minimumzoomscale = 0.2;

}

Proxy methods for #pragma mark-uiscrollview

#pragma mark this method returns a control that can be used for pinch gesture scaling operations

#pragma mark will call when Uiscrollview attempts to scale.

-(UIView *) Viewforzoominginscrollview: (Uiscrollview *) ScrollView

{

return _imageview;

}

#pragma mark calls when zoom is complete

-(void) scrollviewdidendzooming: (Uiscrollview *) ScrollView Withview: (UIView *) View Atscale: (float) scale

{

NSLog (@ "End Zoom-%f", scale);

}

#pragma mark is calling when zooming.

-(void) Scrollviewdidzoom: (Uiscrollview *) ScrollView

{

NSLog (@ "-----");

}

@end

uiscrollview-big Picture Show and picture Zoom Demo