iOS开发-自定义scrollView

前言

banner使用自定义scrollView会让视图更美观。

效果

代码

• LDSScrollView.h

#import <UIKit/UIKit.h>

@interface LDSScrollView : UIScrollView

@end

• LDSScrollView.m

#import "LDSScrollView.h"

@implementation LDSScrollView

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event {
    
    
    CGRect rect = self.bounds;
    rect.origin.x -= 20.f;
    rect.size.width = [UIScreen mainScreen].bounds.size.width;
    if (CGRectContainsPoint(rect, point)) {
    
    
        return YES;
    }
    
    return [super pointInside:point withEvent:event];
}

@end

使用

• ViewController.m

#import "ViewController.h"
#import "LDSScrollView.h"

@interface ViewController ()

@property (nonatomic, strong) NSArray *imageArr;
@property (nonatomic, strong) LDSScrollView *scrollView;

@end

@implementation ViewController

- (void)viewDidLoad {
    
    
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    [self.view addSubview:self.scrollView];
    
    [self scrollViewDemo];
}

- (void)scrollViewDemo {
    
    
    NSInteger count = self.imageArr.count;
    
    self.scrollView.contentSize = CGSizeMake((self.view.frame.size.width - 60.f) * count, (self.view.frame.size.width - 80.f) / 2);
    
    //添加图片
    for (int i = 0; i < count; i ++) {
    
    
        UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(20.f + i * (self.view.frame.size.width - 60.f), 0.f, self.view.frame.size.width - 80.f, (self.view.frame.size.width - 80.f) / 2)];
        imageView.tag = i;
        imageView.backgroundColor = [UIColor grayColor];
        imageView.userInteractionEnabled = YES;
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(clickImageViewAction:)];
        [imageView addGestureRecognizer:tap];
        [self.scrollView addSubview:imageView];
    }
}

- (LDSScrollView *)scrollView {
    
    
    if(_scrollView == nil) {
    
    
        _scrollView = [[LDSScrollView alloc] initWithFrame:CGRectMake(20.f, 100.f, self.view.frame.size.width - 60.f, (self.view.frame.size.width - 80.f) / 2)];
        _scrollView.pagingEnabled = YES;
        _scrollView.clipsToBounds = NO;
    }
    return _scrollView;
}

- (NSArray *)imageArr {
    
    
    if(_imageArr == nil) {
    
    
        _imageArr = @[@"0", @"1", @"2", @"3", @"4"];
    }
    return _imageArr;
}

- (void)clickImageViewAction:(UITapGestureRecognizer *)sender {
    
    
    NSInteger index = sender.view.tag;
    NSLog(@"imageView tag %ld", (long)index);
}

@end