仿window阿里旺旺登陆界面,打印机吐纸动画效果-b

偶然的机会发现window的阿里旺旺的登陆效果蛮有意思的，于是就模仿着做了一下打印机吐纸的动画效果
看起来很神奇的东西，实现起来却不难，下面我给大家看下主要的源码。

- (void)createUI{    UIImageView *backimageView=[[UIImageView alloc]init];    
    backimageView.image =[UIImage imageNamed:@"1.png"];    
    backimageView.frame = CGRectMake(50, 100, LBSCREEN_WIDTH-100, 30);    
    [self.view addSubview:backimageView];    
    backView = [[UIView alloc]initWithFrame:CGRectMake(60, 115, LBSCREEN_WIDTH-120, 0)];    
    backView.layer.cornerRadius = 5;    
    backView.backgroundColor = [UIColor whiteColor];    
    backView.layer.borderWidth = 1;    
    backView.layer.borderColor = [UIColor blackColor].CGColor;    
    backView.clipsToBounds = YES;    
    [self.view addSubview:backView];    
    login_btn = [UIButton buttonWithType:UIButtonTypeCustom];    
    login_btn.frame = CGRectMake(10, 120, LBSCREEN_WIDTH-140, 35);    
    [login_btn setTitle:@"登陆" forState:UIControlStateNormal];    
    login_btn.backgroundColor = [UIColor lightGrayColor];    
    login_btn.layer.cornerRadius = 5;    
    login_btn.layer.borderWidth = 1;    
    login_btn.layer.borderColor = [UIColor lightGrayColor].CGColor;    
    [login_btn addTarget:self action:@selector(passwordClick:) forControlEvents:UIControlEventTouchUpInside];    
    login_btn.clipsToBounds = YES;    
    pass_btn = [UIButton buttonWithType:UIButtonTypeCustom];    
    pass_btn.frame = CGRectMake(10, 165, LBSCREEN_WIDTH-140, 35);    
    [pass_btn setTitle:@"注册" forState:UIControlStateNormal];    
    pass_btn.backgroundColor = [UIColor redColor];    
    [pass_btn addTarget:self action:@selector(passwordClick:) forControlEvents:UIControlEventTouchUpInside];    
    pass_btn.layer.cornerRadius = 5;    
    pass_btn.layer.borderWidth = 1;    
    pass_btn.layer.borderColor = [UIColor lightGrayColor].CGColor;    
    pass_btn.clipsToBounds = YES;    
    Name_textfield = [[UITextField alloc]initWithFrame:CGRectMake(10, 20, LBSCREEN_WIDTH-140, 40)];    
    Name_textfield.placeholder = @"帐号";    
    Name_textfield.borderStyle = UITextBorderStyleRoundedRect;    
    Pass_textfield = [[UITextField alloc]initWithFrame:CGRectMake(10, 70, LBSCREEN_WIDTH-140, 40)];    
    Pass_textfield.borderStyle = UITextBorderStyleRoundedRect;    
    Pass_textfield.placeholder = @"密码";    //2秒后开始一个持续一分钟的动画    
    [UIView animateWithDuration:1 delay:2 options:UIViewAnimationOptionBeginFromCurrentState animations:^{        
        backView.frame=CGRectMake(60, 115, LBSCREEN_WIDTH-120, 210);    
    } completion:^(BOOL finished) {          [backView addSubview:Name_textfield];        
          dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{            
            [backView addSubview:Pass_textfield];            
                dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{                
                  [backView addSubview:login_btn];                
                  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{                    
                    [backView addSubview:pass_btn];                
                   });            
            });        
        });
     }];
 }
 - (void)passwordClick:(UIButton *)sender{
     NSLog(@"hhhhh....");
 }

不难看懂吧？主要就用到了一个改变frame的动画，x轴和y轴以及宽不变，改变它的高
下面晒下效果图

(http://allluckly.cn)

源码下载的地址

下载地址:https://github.com/AllLuckly/LBPrinterPaper