MASExampleScrollView.m
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//
// MASExampleScrollView.m
// Masonry iOS Examples
//
// Created by Jonas Budelmann on 20/11/13.
// Copyright (c) 2013 Jonas Budelmann. All rights reserved.
//
#import "MASExampleScrollView.h"
/**
* UIScrollView and Auto Layout don't play very nicely together see
* https://developer.apple.com/library/ios/technotes/tn2154/_index.html
*
* This is an example of one workaround
*
* for another approach see https://github.com/bizz84/MVScrollViewAutoLayout
*/
@interface MASExampleScrollView ()
@property (strong, nonatomic) UIScrollView* scrollView;
@end
@implementation MASExampleScrollView
- (id)init {
self = [super init];
if (!self) return nil;
UIScrollView *scrollView = UIScrollView.new;
self.scrollView = scrollView;
scrollView.backgroundColor = [UIColor grayColor];
[self addSubview:scrollView];
[self.scrollView makeConstraints:^(MASConstraintMaker *make) {
make.edges.equalTo(self);
}];
// We create a dummy contentView that will hold everything (necessary to use scrollRectToVisible later)
UIView* contentView = UIView.new;
[self.scrollView addSubview:contentView];
[contentView makeConstraints:^(MASConstraintMaker *make) {
make.edges.equalTo(self.scrollView);
make.width.equalTo(self.scrollView.width);
}];
UIView *lastView;
CGFloat height = 25;
for (int i = 0; i < 10; i++) {
UIView *view = UIView.new;
view.backgroundColor = [self randomColor];
[contentView addSubview:view];
// Tap
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTap:)];
[view addGestureRecognizer:singleTap];
[view mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(lastView ? lastView.bottom : @0);
make.left.equalTo(@0);
make.width.equalTo(contentView.width);
make.height.equalTo(@(height));
}];
height += 25;
lastView = view;
}
// dummy view, which determines the size of the contentView size and therefore the scrollView contentSize
UIView *sizingView = UIView.new;
[scrollView addSubview:sizingView];
[sizingView makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(lastView.bottom);
make.bottom.equalTo(contentView.bottom);
}];
return self;
}
- (UIColor *)randomColor {
CGFloat hue = ( arc4random() % 256 / 256.0 ); // 0.0 to 1.0
CGFloat saturation = ( arc4random() % 128 / 256.0 ) + 0.5; // 0.5 to 1.0, away from white
CGFloat brightness = ( arc4random() % 128 / 256.0 ) + 0.5; // 0.5 to 1.0, away from black
return [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:1];
}
- (void)singleTap:(UITapGestureRecognizer*)sender {
[sender.view setAlpha:sender.view.alpha / 1.20]; // To see something happen on screen when you tap :O
[self.scrollView scrollRectToVisible:sender.view.frame animated:YES];
};
@end