How to create a UIScrollView Programmatically?

Alright, so the key here is I'm not using IB at all, because the View I'm working with is created programmatically. The UIView covers the lower half the screen, and has a bunch of buttons on it. However, I want to add more buttons to the UIView, without making it any larger. To do so, I want to make a UIScrollView inside the view, which will allow me to add more buttons off screen so the user can scroll to them. I think that's how it works.

self.manaView = [[[UIView alloc] initWithFrame:frame] autorelease];
self.manaView.backgroundColor = [UIColor purpleColor];

UIScrollView *scroll = [UIScrollView alloc];
scroll.contentSize = CGSizeMake(320, 400);
scroll.showsHorizontalScrollIndicator = YES;
[self.manaView addSubview:scroll];

The first part of the code iniates my UIView, which works great, but I can't figure out how 开发者_Go百科to make the UIScrollView programmatically and add it to the view, and then add the buttons to it.

UIButton *ret2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
ret2.tag = 102;
ret2.frame = CGRectMake(255, 5, 60, 50);
[ret2 setTitle:@"Return" forState:UIControlStateNormal];
[ret2 addTarget:self action:@selector(flipAction:) forControlEvents:UIControlEventTouchUpInside];
[scroll addSubview:ret2];

When I did that, the button simply disappeared off my screen. So How do I do this correctly? Thank you for your help!

Instead of:

UIScrollView *scroll = [UIScrollView alloc];

do this (setting the frame to however big you want the scroll view to be):

UIScrollView *scroll = [[UIScrollView alloc] initWithFrame:...];

This may be helpful to you for creating the uiscrollview programmatically
http://unconditionalloop.blogspot.com/2011/04/uiscrollview-programmatically.html

  UIScrollView *scrollview = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];   
     NSInteger viewcount= 4;  
     for(int i = 0; i< viewcount; i++) { 

        CGFloat y = i * self.view.frame.size.height;  
        UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, y,self.view.frame.size.width, self .view.frame.size.height)];       
        view.backgroundColor = [UIColor greenColor];  
        [scrollview addSubview:view];  
        [view release];  
     }    
  scrollview.contentSize = CGSizeMake(self.view.frame.size.width, self.view.frame.size.height *viewcount);   
  [self.view addSubview:scrollview];

try this,

{

        scrollview=[[UIScrollView alloc]initWithFrame:CGRectMake(0,0,320,480)]; 
        scrollview.showsVerticalScrollIndicator=YES;
        scrollview.scrollEnabled=YES;
        scrollview.userInteractionEnabled=YES;
        [self.view addSubview:scrollview];
        scrollview.contentSize = CGSizeMake(width,height);

    [scrollview release];
}

Create a UiScrollView Programitically

ScrView = [[UIScrollView alloc]initWithFrame:CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height)];
ScrView.showsVerticalScrollIndicator=YES;
[ScrView setBackgroundColor:[UIColor yellowColor]];
[ScrView setScrollEnabled:YES];
[ScrView setContentSize:CGSizeMake(0, 700)];
[ScrView setShowsHorizontalScrollIndicator:YES];
[ScrView setShowsVerticalScrollIndicator:YES];
[self.view addSubview:ScrView];

I use lazy a lot when creating UI programmatically, like this:

class WorldViewController: UIViewController {
    override func loadView() {
        super.loadView()
        view = scrollView
        scrollView.addSubview(label0)
    }

    lazy var scrollView: UIScrollView = {
        let instance = UIScrollView()
        instance.backgroundColor = UIColor.blackColor()
        return instance
    }()

    lazy var label0: UILabel = {
        let instance = UILabel()
        instance.text = "Ice caps are melting"
        instance.textColor = UIColor.whiteColor()
        instance.sizeToFit()
        return instance
    }()

    var needLayoutContent = true

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        if needLayoutContent {
            let bounds = scrollView.bounds
            let contentSize = CGSizeMake(bounds.width * 1.5, bounds.height * 1.5)
            label0.center = CGPointMake(contentSize.width / 2, contentSize.height / 2)
            scrollView.contentSize = contentSize
            scrollView.contentOffset = CGPointMake(bounds.width * 0.25, bounds.height * 0.25)
            needLayoutContent = false
        }
    }
}

Simple Method: You can create multiple times if you need more

- (void)viewDidLoad
{
    [super viewDidLoad];

    int x = 0;
    int y = 10;
    for(int i=0; i<5; i++)
    {
        UIScrollView *scrollview=[[UIScrollView alloc]initWithFrame:CGRectMake(x, y, 50, 50)];
        scrollview.showsVerticalScrollIndicator=YES;
        scrollview.scrollEnabled=YES;
        scrollview.userInteractionEnabled=YES;
        scrollview.backgroundColor = [UIColor greenColor];
        [self.view addSubview:scrollview];
        //scrollview.contentSize = CGSizeMake(50,50);
        x=x+55;

        //[self myscrollView];
    }
}

Calculate distance between 2 point on maps for iOS [closed]

import UIKit import CoreLocation

class ViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    var myLocation = CLLocation(latitude: 23.1929, longitude: 72.6156)
    var myBuddysLocation = CLLocation(latitude: 23.0504, longitude: 72.4991)
    var distance = myLocation.distance(from: myBuddysLocation) / 1000
    print(String(format: "The distance to my buddy is %.01fkm", distance))
}

}