iOS开发弧形菜单

因为公司项目的需求，需要一个弧形滚动的菜单，就写了一个demo。

//  Created by Flynn Lee on 2021/12/5.
//

#import "ViewController.h"
#import "UIView+viewCategory.h"

#define KScreenHeight [UIScreen mainScreen].bounds.size.height

#define KScreenWidth [UIScreen mainScreen].bounds.size.width

@interface ViewController ()<UIScrollViewDelegate>
///滚动scrollView
@property(nonatomic,strong)UIScrollView *scrollView;
///发布按钮
@property(nonatomic,strong)UIButton *publishButton;
///存放cell的数组
@property(nonatomic,strong)NSMutableArray<UIView *> *cells;
@end

@implementation ViewController
-(UIScrollView *)scrollView
{
    if (!_scrollView) {
        
        _scrollView = [[UIScrollView alloc]init];
        
        _scrollView.X = KScreenWidth;
        
        _scrollView.Y = KScreenHeight;
        
        _scrollView.Size = CGSizeZero;
        
        _scrollView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.5];
        
        _scrollView.delegate = self;
        
        _scrollView.contentSize = CGSizeMake(0, 95 * 50);
        
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(scrollViewRemove)];
        
        [_scrollView addGestureRecognizer:tap];
         
    }
    
    return _scrollView;
}

-(UIButton *)publishButton
{
    if (!_publishButton) {
        _publishButton = [[UIButton alloc]init];
        _publishButton.Size = CGSizeMake(80, 80);
        _publishButton.X = KScreenWidth - 100;
        _publishButton.Y = KScreenHeight - 120;
        _publishButton.backgroundColor = [UIColor purpleColor];
        [_publishButton setTitle:@"发布" forState:UIControlStateNormal];
        _publishButton.layer.masksToBounds = YES;
        _publishButton.layer.cornerRadius = 40;
        [_publishButton addTarget:self action:@selector(publishButtonClick:) forControlEvents:UIControlEventTouchUpInside];
    }
    return _publishButton;
}

-(NSMutableArray<UIView *> *)cells
{
    if (!_cells) {
        _cells = [NSMutableArray array];
    }
    return _cells;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self.view addSubview:self.publishButton];
    
}

-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    [self.cells enumerateObjectsUsingBlock:^(UIView * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {

        CGRect objFrame = [self.scrollView convertRect:obj.frame toView:self.view];

        if (obj.X < 0) {

            obj.X = 0;

        }else{

            obj.X = (objFrame.origin.y < KScreenHeight/2) ? objFrame.origin.y/KScreenHeight * KScreenWidth : (1-objFrame.origin.y/KScreenHeight) * KScreenWidth;
        }

        obj.Width = KScreenWidth - obj.X;
    }];
}

-(void)publishButtonClick:(UIButton *)button
{
    [self.view addSubview:self.scrollView];
    
    [self createCell];
    
    [UIView animateWithDuration:0.5 animations:^{
        
        self.scrollView.frame = [UIScreen mainScreen].bounds;
    }];
}

-(void)scrollViewRemove
{
    [UIView animateWithDuration:0.5 animations:^{
        
        self.scrollView.X = self.view.Width;
        
        self.scrollView.Y = self.view.Height;
        
        self.scrollView.Size = CGSizeMake(0, 0);
        
    } completion:^(BOOL finished) {
        
        [self.scrollView removeFromSuperview];
        
        self.scrollView = nil;
        
        if (self.cells.count > 0) {
            
            [self.cells makeObjectsPerformSelector:@selector(removeFromSuperview)];
        }
    }];
}

-(void)createCell
{
    [self.cells removeAllObjects];
    
    CGFloat cellX = 0;
    
    CGFloat cellY = 0;
    
    CGFloat cellW = 0;
    
    CGFloat cellH = 80;
    
    CGFloat margin = 15;
    
    for (int i = 0; i < 50; i++) {
        
        cellY = CGRectGetMaxY([self.cells lastObject].frame) + margin;
        
        cellX = (cellY < KScreenHeight/2) ? cellY/KScreenHeight * KScreenWidth : (1-cellY/KScreenHeight) * KScreenWidth;
        
        cellW = KScreenWidth - cellX;
        
        UIView *cell = [[UIView alloc]init];
        
        cell.frame = CGRectMake(cellX, cellY, cellW, cellH);
        
        cell.backgroundColor = [UIColor colorWithRed:arc4random_uniform(255)/255.0 green:arc4random_uniform(255)/255.0 blue:arc4random_uniform(255)/255.0 alpha:1];
        
        [self.scrollView addSubview:cell];
        
        [self.cells addObject:cell];
    }
    
}

@end