UIScrollView代理

代理

用户开始拖拽时，调用scrollViewWillBeginDragging:方法

具体滚动到某个位置时，调用scrollViewDidScroll:方法

用户停止拖拽时，
调用scrollViewDidEndDragging:willDecelerate:方法

 #import <UIKit/UIKit.h>

@interface XMGDog : NSObject<UIScrollViewDelegate,UITextFieldDelegate>

@end

#import "XMGDog.h"

@implementation XMGDog

-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    NSLog(@"@监听到了滚动",self);
    
}

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSLog(@"shouldChangeCharactersInRange--@",string);
    return NO;
    
}


-(void)textFieldDidEndEditing:(UITextField *)textField
{


}
@end

#import "ViewController.h"
#import "XMGDog.h"
@interface ViewController ()<UIScrollViewDelegate>
@property (weak, nonatomic) IBOutlet UIScrollView *scrollView;
/**  dog  */
@property(nonatomic,strong)XMGDog * dog ;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"minion"]];
    [self.scrollView addSubview:imageView];
    self.scrollView.backgroundColor=[UIColor    redColor];
    self.scrollView.contentSize=imageView.image.size;
    
    self.dog=[[XMGDog alloc]init];
    self.scrollView.delegate=self.dog;
    
    UITextField *textField=[[UITextField  alloc]init];
    textField.frame=CGRectMake(20, 300, 200, 30);
    textField.backgroundColor=[UIColor blueColor];
//    [textField addTarget:self action:@selector(textChange) forControlEvents:UIControlEventEditingChanged];
    textField.delegate=self.dog;
    [self.view addSubview:textField];
    
    
}

//-(void)textChange:(UITextField*)textField
//{
//    NSLog(@"tEXTchang--------@",textField.text);
//}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark-<UIScrollViewDelegate>
-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    //滚动时
}

-(void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView
{
    //开始
}

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    //结束
}


-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
    
    //减速完毕
}


@end