iOS:Masonry+UIView动画

Question

我正在尝试使用 [UIView animationWithDuration] 方法通过约束为 UIView 设置动画。

我非常熟悉使用 UIView.frame 的动画，这非常简单。

在 init 方法中我添加了那些子视图

-(instancetype)init
{
    if (self = [super init]) {
        [self addSubview:self.bg_view];
        [self.bg_view addSubview:self.content];
        [self.bg_view addSubview:self.titleView];
        [self.bg_view addSubview:self.reward];
    }
    return self;
}

和Masonry文件中显示的一样，约束设置在

-(void)updateConstraints
{
    [self makeConstraints:^(MASConstraintMaker *make) {
        make.edges.equalTo([UIApplication sharedApplication].keyWindow);
    }];

    [self.bg_view makeConstraints:^(MASConstraintMaker *make) {
        make.edges.equalTo(self);
    }];

    [self.titleView makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(self.bg_view.centerX);
        make.top.equalTo(self.bg_view.top).with.offset(150);
    }];

    [self.content makeConstraints:^(MASConstraintMaker *make) {
        make.width.equalTo(self.bg_view).with.offset(-k_Margin*2);
        make.bottom.equalTo(self.reward.top).with.offset(-20);
        make.centerX.equalTo(self.bg_view);
        make.top.equalTo(self.titleView.bottom).with.offset(20);
    }];

    [self.reward makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(self.bg_view.centerX);
        make.top.equalTo(self.content.bottom).with.offset(20);
        make.bottom.equalTo(self.bg_view.bottom).with.offset(-40);
    }];

    [super updateConstraints];
}

并且在show方法中

-(void)show
{
    [[UIApplication sharedApplication].keyWindow addSubview:self];
    [self setNeedsUpdateConstraints];
    [UIView animateWithDuration:5.0f animations:^{
        /* I have tried variety ways to get the uiview come into the 
screen from the top*/
    }];

}

Answer 1

我在下面发布了一些代码来帮助您实现此目的，我使用了 viewcontroller，如果您愿意，您可以像 Masonry 示例中那样使用 UIView。我在我的视图上放置了一个按钮并将其连接到我的 'show' 方法。

看看 Masonry 项目中的 iOS 示例，它们很有帮助。

@interface MyViewController ()

@property (nonatomic) UIView *subView;
@property (nonatomic) CGFloat topValue;

@end

@implementation MyViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.subView = [[UIView alloc] init];
    self.subView.backgroundColor = [UIColor blueColor];
    [self.view addSubview:self.subView];
    self.topValue = -128;
}

- (void)updateViewConstraints {
    [self.subView mas_updateConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(@(self.topValue));
        make.width.equalTo(@128);
        make.height.equalTo(@128);
        make.leading.equalTo(@0);
    }];

    [super updateViewConstraints];
}

- (IBAction)show:(id)sender {
    self.topValue = (self.topValue == 0) ? -128 : 0;

    [self.view setNeedsUpdateConstraints];

    [self.view updateConstraintsIfNeeded];

    [UIView animateWithDuration:1.0 animations:^{
        [self.view layoutIfNeeded];
    }];
}

iOS:Masonry+UIView动画

iOS:Masonry+UIView animation

animation

objective-c

ios

masonry