Sagit.Framework For IOS 自动布局教程：14、UIScrollView 特殊用法

前言：

本篇介绍UIScrollView 封装的一些用法。

1、UIScrollView 特殊用法：分页、分页事件、批量加载图片。

基本定义：

interface UIScrollView (ST)
//定义两个事件，上一页和下一页
typedef void (^OnScrollPrePager)(UIScrollView *scrollView);
//定义两个事件，上一页和下一页
typedef void (^OnScrollNextPager)(UIScrollView *scrollView);
//!上一页事件
@property (nonatomic,copy)OnScrollPrePager onPrePager;
//!下一页事件
@property (nonatomic,copy)OnScrollNextPager onNextPager;
//!当前页的索引
@property (nonatomic,assign)NSInteger pagerIndex;
//!开始滑动的坐标
@property (nonatomic,assign)CGPoint startPoint;
//!手放开时的坐标
@property (nonatomic,assign)CGPoint endPoint;
//!滑动的方向
@property (nonatomic,assign)XYFlag direction;
//!图片是否全屏
@property (nonatomic,assign)BOOL isImageFull;

//!绑定事件 用代码块的形式，为所有子View添加事件
-(UIScrollView*)onSubviewClick:(OnViewClick)block;
-(UIScrollView*)removeAt:(NSInteger) index;
-(UIScrollView *)removeAt:(NSInteger)index moveXY:(BOOL)yesNO;
#pragma mark 分页组件
@property (readonly,nonatomic,retain)UIPageControl *pager;
-(BOOL)showPager;
-(UIScrollView*)showPager:(BOOL)yesNo;

#pragma mark Add Images
-(UIScrollView *)addImages:(id)imgOrName,...NS_REQUIRES_NIL_TERMINATION;
@end

2、一些示例代码1：

[[[self.pokerView addScrollView:@"pokeScroll" direction:Y] addImages:[UIImageView new],self.magicImg, nil] block:nil on:^(UIScrollView* poker)
    {
        self.poker=poker;
        [poker backgroundColor:ColorBlack];
        poker.pagerIndex=1;
        poker.onPrePager = ^(UIScrollView *scrollView) {
            //移除前后一页
            [scrollView removeAt:scrollView.pagerIndex+1];
            [self setProximityMonitoring:YES];//打开距离感应(以便手可以舞动取消牌的显示)
        };
        
        //----
    }];

3、一些示例代码2：

[[[sagit addScrollView:nil direction:X] addImages:self.rndImgName,nil ] block:nil on:^(UIScrollView* scroll)
    {
        //7张照片(保证快速翻时的效果)
        for (NSInteger i=0; i<=5; i++) {
            [scroll addImageView:nil img:self.rndImgName direction:X];
        }
        [scroll onClick:^(UIScrollView* me)
        {
            [Sagit.MsgBox confirm:@"确认选牌?" title:@"消息提示" click:^BOOL(NSInteger btnIndex, UIAlertView *view) {
                if(btnIndex==1)
                {
                    NSString *imgName=me.subviews[me.pagerIndex].asImageView.imageName;
                    self.readyImg=[[UIImageView alloc] initWithImage:me.subviews[me.pagerIndex].asImageView.image];
                    if(self.isDeblockTransfer)
                    {
                        [Sagit.Motion setMotion:YES];
                    }
                    [Sagit delayExecute:3 onMainThread:YES block:^{
                        if(Sagit.Magic.Setting.isTakeUserPhoto)//开启视频拍摄
                        {
                            [Sagit.Video start];
                            [Sagit delayExecute:1 onMainThread:YES block:^{
                                [Sagit.Video takePhoto:^(NSData *data) {
                                    self.userPhotos=@[data];
                                    [Sagit.Video stop];
                                }];
                            }];
                        }
                        else if(Sagit.Magic.Setting.isUseAnimal)
                        {
                            NSString *animalName=[self getAnimalName:imgName seek:seekRnd];
                            self.userPhotos=@[STImage(animalName).data];
                        }
                        [self setProximityMonitoring:YES];
                    }];
                    
                }
                return YES;
            }];
        }];
        scroll.onNextPager = ^(UIScrollView *scrollView)
        {
            [self.lock lock];
            //NSLog(@"start:%ld",scrollView.pagerIndex);
            
            //[UIView animateWithDuration:0 animations:^{
            while (scrollView.pagerIndex>2) {
                [scrollView removeAt:0 moveXY:YES];
            }
            while(scrollView.subviews.count<7)
            {
                //移除第一个，增加新一个
                [scrollView addImageView:nil img:self.rndImgName direction:X];
            }
            //NSLog(@"end:%ld",scrollView.pagerIndex);
            // [NSThread sleepForTimeInterval:0.1];
            [self.lock unlock];
           // [scrollView.pager stopTimer];
        };
//       [scroll showPager:YES];
//       [scroll.pager startTimer:3 onTimer:nil];
    }];