隨意寫的小Demo,適合慢慢顯示彈出框的效果以及切換兩個界面，代碼很簡單老虫，可是項目中很實用叶骨，至少對我?guī)椭艽螅卮擞涗浧沓祝Ч缦拢?/p>

demo.gif

代碼如下：

#import "AnimationViewController.h"

@interface AnimationViewController ()
{
    UIView *view1;
    UIButton *btn;
    
    UIView *view2;
    UIButton *btn2;
}

@end

@implementation AnimationViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor = [UIColor whiteColor];
    self.title = @"動畫效果";
    
    //1.動畫漸隱漸現(xiàn)效果
    
    view1 = [[UIView alloc] initWithFrame:CGRectMake(30,74 , self.view.frame.size.width-60, 80)];
    view1.backgroundColor = [UIColor infoBlueColor];
    view1.alpha = 1;
    [self.view addSubview:view1];
    
    btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.tag = 1;
    [btn setTitle:@"漸隱/漸現(xiàn)" forState:UIControlStateNormal];
    [btn setTitle:@"漸隱/漸現(xiàn)" forState:UIControlStateSelected];
    [btn setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
    [btn setTitleColor:[UIColor blueColor] forState:UIControlStateSelected];
    [btn addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside];
    btn.frame = CGRectMake(70, CGRectGetMaxY(view1.frame)+20, self.view.frame.size.width-140, 30);
    [self.view addSubview:btn];
    
    
    //2.兩個view切換
    view2 = [[UIView alloc] initWithFrame:CGRectMake(30,74 , self.view.frame.size.width-60, 80)];
    view2.backgroundColor = [UIColor redColor];
    view2.alpha = 0;
    [self.view addSubview:view2];
    
    btn2 = [UIButton buttonWithType:UIButtonTypeCustom];
    btn2.tag = 2;
    [btn2 setTitle:@"切換" forState:UIControlStateNormal];
    [btn2 setTitle:@"切換" forState:UIControlStateSelected];
    [btn2 setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
    [btn2 setTitleColor:[UIColor blueColor] forState:UIControlStateSelected];
    [btn2 addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside];
    btn2.frame = CGRectMake(70, CGRectGetMaxY(btn.frame)+20, self.view.frame.size.width-140, 30);
    [self.view addSubview:btn2];
}


- (void)btnAction:(UIButton *)sender
{
    if (sender.tag == 1)
    {
        if (!btn.selected)
        {
            [UIView animateWithDuration:1 animations:^{
                view1.alpha = 0;
            } completion:^(BOOL finished) {
                [sender setSelected:YES];
            }];
        }
        else
        {
            [UIView animateWithDuration:1 animations:^{
                view1.alpha = 1;
            } completion:^(BOOL finished) {
                [sender setSelected:NO];
            }];
        }
    }
    else
    {
        if (!btn2.selected)
        {
            [UIView animateWithDuration:0.5 animations:^{
                view2.alpha = 1;
            } completion:^(BOOL finished) {
                [UIView transitionFromView:view1 toView:view2 duration:1 options:UIViewAnimationOptionTransitionCurlUp completion:^(BOOL finished) {
                    [sender setSelected:YES];
                }];
            }];
            
        }
        else
        {
            [UIView transitionFromView:view2 toView:view1 duration:1 options:UIViewAnimationOptionTransitionCrossDissolve completion:^(BOOL finished) {
                [sender setSelected:NO];
            }];
        }
    }
    
}

Tip

view的漸隱漸現(xiàn)就是設置view的alpha忽刽，設置動畫時長即可。