iOS之放大头像

放大头像

查看大图的方法

-(void) datu :(UIImage *) img {
    
    CGFloat iconW = self.view.frame.size.width;
    CGFloat iconH = iconW;
    CGFloat iconX = 0;
    CGFloat iconY = (self.view.frame.size.height - iconH) * 0.5;
    
    UIView *bigView = [[UIView alloc] init];
    
    bigView.frame = self.view.bounds;
    
    bigView.backgroundColor = [UIColor blackColor];
    
    bigView.alpha = 0;
    
    self.bigView = bigView;
    
    UITapGestureRecognizer *viewTap  = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(clickView)];
    
    [bigView addGestureRecognizer:viewTap];
    
    [self.view addSubview:bigView];
    
    UIImageView *imgView = [[UIImageView alloc] init];
    
    imgView.frame = CGRectMake(iconX, iconY, iconW, iconH);
    
    imgView.image = img;
    
    [bigView addSubview:imgView];
    
    [UIView animateWithDuration:0.5 animations:^{
        
        bigView.alpha = 1;
        
    }];
       
}

大图变回小图

-(void) clickView {
    
    [UIView animateWithDuration:1.0 animations:^{
        // 1. 通过动画的方式,设置遮罩透明度为 0,
        self.bigView.alpha = 0;
    } completion:^(BOOL finished) {
        // 2. 动画执行完毕之后要执行的代码
        // 动画执行完毕之后,将遮罩从父控件中移除,并清空
        [self.bigView removeFromSuperview];
        self.bigView = nil;
    }];
    
}

END.