如何在 iOS 中使用 UIView 动画显示 UIView，如 UIAction 表？答案

【问题标题】：How to show UIView like UIAction sheet using UIView animations in iOS?如何在 iOS 中使用 UIView 动画显示 UIView，如 UIAction 表？
【发布时间】：2015-12-21 06:52:13
【问题描述】：

嗨，我是 iOS 新手，我在 MainViewController 的底部添加了一个 UIView。

当我点击一个按钮时，UIView 使用UIView 动画显示为“UIAction sheet”。

为此，我尝试了下面的代码，但是当我点击按钮时动画不适用。

请帮助我。

我的代码：-

#import "AnimationUIview.h"

@interface AnimationUIview ()
{
    UIView * firstView;
    NSLayoutConstraint * Bottom;
}

@end

@implementation AnimationUIview

- (void)viewDidLoad {
    [super viewDidLoad];

    firstView = [[UIView alloc] init];
    firstView.backgroundColor = [UIColor lightGrayColor];
    firstView.translatesAutoresizingMaskIntoConstraints = NO;
    [self.view addSubview:firstView];

    NSDictionary * views = NSDictionaryOfVariableBindings(firstView);

    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[firstView]-0-|" options:0 metrics:nil views:views]];
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[firstView(100)]" options:0 metrics:nil views:views]];

    Bottom = [NSLayoutConstraint constraintWithItem:firstView
                                       attribute:NSLayoutAttributeBottom
                                       relatedBy:NSLayoutRelationEqual
                                          toItem:self.view
                                       attribute:NSLayoutAttributeBottom
                                      multiplier:1
                                        constant:80];
    [self.view addConstraint:Bottom];
}

- (IBAction)buttonAction:(id)sender {

    [UIView animateWithDuration:0.5f
                          delay:0.0f
                        options:UIViewAnimationOptionBeginFromCurrentState
                     animations:^{

                         Bottom.constant = -10;
                     }
                     completion:nil];
}

@end

【问题讨论】：

标签： ios iphone animation uiview uiactionsheet

【解决方案1】：

#import "AnimationUIview.h"

@interface AnimationUIview () {
    UIView * firstView;
    NSLayoutConstraint * Bottom;
    BOOL isshown;
}

@end
@implementation AnimationUIview
-(void)viewDidLoad {
    [super viewDidLoad];

    firstView = [[UIView alloc] init];
    firstView.backgroundColor = [UIColor lightGrayColor];
    firstView.translatesAutoresizingMaskIntoConstraints = NO;
    [self.view addSubview:firstView];

    NSDictionary * views = NSDictionaryOfVariableBindings(firstView);

    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[firstView]-0-|" options:0 metrics:nil views:views]];
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[firstView(100)]" options:0 metrics:nil views:views]];

    Bottom = [
             NSLayoutConstraint
             constraintWithItem:firstView
             attribute:NSLayoutAttributeBottom
             relatedBy:NSLayoutRelationEqual
             toItem:self.view
             attribute:NSLayoutAttributeBottom
             multiplier:1
             constant:80
    ];
    [self.view addConstraint:Bottom];
    isshown=No;

}

- (IBAction)buttonAction:(id)sender {

    if (isshown==NO) {
        firstview.frame =  CGRectMake(0,0, SCREEN_WIDTH, 100);
        [UIView animateWithDuration:0.40 animations:^{
            firstview.frame =  CGRectMake(0, SCREEN_HEIGHT-100, SCREEN_WIDTH, 100);
            [firstview setAlpha:0.0f];
        } completion:^(BOOL finished) {

        }];

        isshow=Yes;
    } else {
        firstview.frame =  CGRectMake(0, SCREEN_HEIGHT-100, SCREEN_WIDTH, 100);
        [UIView animateWithDuration:0.40 animations:^{
            firstview.frame =  CGRectMake(0,0, SCREEN_WIDTH, 100);
            firstview.alpha = 1.0f;
        } completion:^(BOOL finished) {
        [firstview setHidden:YES];
    }];

    isshown=No;
}
@end

【讨论】：