////  UIScrollView+YX.h//  PageView////  Copyright (c) 2014年 Y.X. All rights reserved.//#import <UIKit/UIKit.h>#import "YXGCD.h"@interface UIScrollView (YX)@property (nonatomic, strong) NSNumber  *currentPage;    // 当前页码@property (nonatomic, strong) NSNumber  *largestPage;    // 最大页码@property (nonatomic, strong) NSNumber  *timerInterval;  // 时间间隔@property (nonatomic, strong) GCDTimer  *timer;          // 定时器- (void)start;@end

////  UIScrollView+YX.m//  PageView////  Copyright (c) 2014年 Y.X. All rights reserved.//#import "UIScrollView+YX.h"#import <objc/runtime.h>#define  ANIMATION_DURATION   0.2@implementation UIScrollView (YX)static char timerFlag;- (void)setTimer:(GCDTimer *)timer{    objc_setAssociatedObject(self, &timerFlag,                             nil, OBJC_ASSOCIATION_RETAIN_NONATOMIC);    objc_setAssociatedObject(self, &timerFlag,                             timer,                             OBJC_ASSOCIATION_RETAIN_NONATOMIC);}- (GCDTimer *)timer{    return objc_getAssociatedObject(self, &timerFlag);}static char currentPageFlag;- (void)setCurrentPage:(NSNumber *)currentPage{    objc_setAssociatedObject(self, &currentPageFlag,                             nil, OBJC_ASSOCIATION_RETAIN_NONATOMIC);    objc_setAssociatedObject(self, &currentPageFlag,                             currentPage,                             OBJC_ASSOCIATION_RETAIN_NONATOMIC);}- (NSNumber *)currentPage{    return objc_getAssociatedObject(self, &currentPageFlag);}static char largestPageFlag;- (void)setLargestPage:(NSNumber *)largestPage{    objc_setAssociatedObject(self, &largestPageFlag,                             nil, OBJC_ASSOCIATION_RETAIN_NONATOMIC);    objc_setAssociatedObject(self, &largestPageFlag,                             largestPage,                             OBJC_ASSOCIATION_RETAIN_NONATOMIC);}- (NSNumber *)largestPage{    return objc_getAssociatedObject(self, &largestPageFlag);}static char timerIntervalFlag;- (void)setTimerInterval:(NSNumber *)timerInterval{    objc_setAssociatedObject(self, &timerIntervalFlag,                             nil, OBJC_ASSOCIATION_RETAIN_NONATOMIC);    objc_setAssociatedObject(self, &timerIntervalFlag,                             timerInterval,                             OBJC_ASSOCIATION_RETAIN_NONATOMIC);}- (NSNumber *)timerInterval{    return objc_getAssociatedObject(self, &timerIntervalFlag);}- (void)start{    if (self.currentPage != nil && self.largestPage != nil &&         self.timerInterval != nil && self.timer != nil)    {        __weak UIScrollView *weakObj = self;                [self.timer event:^{                        if (ceil(weakObj.contentOffset.x / weakObj.bounds.size.width) ==                 weakObj.contentOffset.x / weakObj.bounds.size.width)            {                weakObj.currentPage       =                     [NSNumber numberWithInt:weakObj.contentOffset.x / 320.f];                                [UIView animateWithDuration:ANIMATION_DURATION animations:^{                    CGPoint point         = weakObj.contentOffset;                                        weakObj.currentPage   =                         [NSNumber numberWithInt:[weakObj.currentPage intValue] + 1];                    point.x               =                         ([weakObj.currentPage intValue] % [weakObj.largestPage intValue])                            *weakObj.bounds.size.width;                                        weakObj.contentOffset = point;                }];            }                    } timeInterval:NSEC_PER_SEC * [self.timerInterval floatValue]];                [[GCDQueue mainQueue] execute:^{            [weakObj.timer start];        } afterDelay:NSEC_PER_SEC * [self.timerInterval floatValue]];    }    else    {        NSLog(@"请配置参数,亲:)");    }}@end

////  RootViewController.m//  PageView////  Copyright (c) 2014年 Y.X. All rights reserved.//#import "RootViewController.h"#import "YXGCD.h"#import "UIScrollView+YX.h"@interface RootViewController ()<UIScrollViewDelegate>@property (nonatomic, strong) GCDTimer  *timer;@property (nonatomic, assign) NSInteger  currentPage;@property (nonatomic, assign) NSInteger  largestPage;@end@implementation RootViewController- (void)viewDidLoad{    [super viewDidLoad];    self.view.backgroundColor = [UIColor blackColor];    // 数据源    NSArray *array = @[@"YouXianMing", @"QiuLiang", @"LinKen", @"KeLinDun"];        // 初始化UIScrollView    UIScrollView *rootView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 320)];    rootView.pagingEnabled = YES;    rootView.contentSize   = CGSizeMake(320*array.count, 320);    [self.view addSubview:rootView];    // 根据数据源加载控件    [array enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {        UILabel *tmp          = [[UILabel alloc] initWithFrame:CGRectMake(idx*320, 0, 320, 320)];        tmp.text              = obj;        tmp.layer.borderWidth = 2.f;        tmp.textColor         = [UIColor cyanColor];        tmp.font              = [UIFont fontWithName:@"HelveticaNeue-Thin" size:30];        tmp.textAlignment     = NSTextAlignmentCenter;        tmp.backgroundColor   = [UIColor colorWithRed:arc4random()%100/100.f                                                green:arc4random()%100/100.f                                                 blue:arc4random()%100/100.f                                                alpha:0.5f];        [rootView addSubview:tmp];    }];        // 设定参数值后开始轮播    rootView.timer         = [[GCDTimer alloc] initInQueue:[GCDQueue mainQueue]];    rootView.currentPage   = [NSNumber numberWithInt:0];    rootView.largestPage   = [NSNumber numberWithInt:array.count];    rootView.timerInterval = [NSNumber numberWithInt:4];    [rootView start];}@end