显示一个类似于UIAlertView的警告视图

Question

我正在尝试创建一个自定义的"警报视图"，没什么太花哨的，我只是想显示一个视图在当前视图的顶部，就像一个UIAlertView。

现在问题来了……我在nib文件中创建了视图，现在我想在需要呈现警报时分配/初始化视图。有人能帮我吗?

这是我试图初始化视图…到目前为止，当我分配/初始化一个新的警报视图时，这会使我的应用程序崩溃。

应用程序崩溃，告诉我视图不符合出口的键值…我肯定已经把出口连接好了，除非我把"文件的所有者"的事情搞砸了。

NSObject 0x14e49800> setValue:forUndefinedKey:]:该类不符合键值编码....

    - (id)initWithCoder:(NSCoder *)aDecoder {
            self = [super initWithCoder:aDecoder];
            if (self) {
                [self load];
            }
            return self;
        }
- (void)load {
    NSArray *views = [[NSBundle mainBundle] loadNibNamed:NSStringFromClass([self class]) owner:nil options:nil];
    [self addSubview:[views firstObject]];
}
    - (void)awakeFromNib {
        [super awakeFromNib];
    }
    - (id)initWithFrame:(CGRect)frame
    {
        self = [[NSBundle mainBundle] loadNibNamed:NSStringFromClass([self class]) owner:nil options:nil][0];
        if (self) {
            [self addSubview:self.contentView];
            self.frame = frame;
        }
        return self;
    }
    - (instancetype)initWithTitle:(NSString *)title
                          message:(NSString *)message
                         delegate:(id)delegate
                cancelButtonTitle:(NSString *)cancelButtonTitle
               confirmButtonTitle:(NSString *)confirmButtonTitle {
        self = [self initWithFrame:CGRectMake(0, 0, 320, 568)];
        if (self) {
        }
        return self;
    }

我用这个方法来呈现视图，只是一个简单的addSubview…

- (void)showInView:(UIView *)view {
    [view addSubview:self];
}

Answer 1

尝试禁用自动布局并运行代码

Answer 2

创建与下面相同的类

#import "MyOverLay.h"
@interface MyOverLay (){
    // control declarations
    UIActivityIndicatorView *activitySpinner;
    UILabel *loadingLabel;
}
@end
@implementation AcuOverLay

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
    }
    return self;
}
- (void)show:(NSString *)message{
    // configurable bits
    self.backgroundColor = [UIColor blackColor];
    self.alpha = 0.75f;
    self.autoresizingMask =UIViewAutoresizingFlexibleHeight;
    float labelHeight = 22;
    float labelWidth = self.frame.size.width - 20;
    // derive the center x and y
    float centerX = self.frame.size.width / 2;
    float centerY = self.frame.size.height / 2;
    // create the activity spinner, center it horizontall and put it 5 points above center x
    activitySpinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
    activitySpinner.frame = CGRectMake(centerX - (activitySpinner.frame.size.width / 2) , centerY - activitySpinner.frame.size.height - 20, activitySpinner.frame.size.width, activitySpinner.frame.size.height);
    activitySpinner.autoresizingMask = UIViewAutoresizingFlexibleHeight;
    [self addSubview:activitySpinner];
    [activitySpinner startAnimating];
    // create and configure the "Loading Data" label
    loadingLabel = [[UILabel alloc]initWithFrame:CGRectMake(centerX - (labelWidth / 2), centerY + 20 , labelWidth, labelHeight)];

    loadingLabel.backgroundColor = [UIColor clearColor];
    loadingLabel.textColor = [UIColor whiteColor];
    loadingLabel.text = message;
    loadingLabel.textAlignment = NSTextAlignmentCenter;
    loadingLabel.autoresizingMask = UIViewAutoresizingFlexibleHeight;
    [self addSubview:loadingLabel];
}
- (void)hide{
    [UIView animateWithDuration:0.5 animations:^{
        self.alpha = 0;
        [self removeFromSuperview];
    }];
}

@end

然后在你想要的地方创建实例

loadingOverlay = [[MyOverLay alloc]initWithFrame:[UIScreen mainScreen].bounds];
        loadingOverlay.tag = 999;
        [[[UIApplication sharedApplication] keyWindow] addSubview:loadingOverlay];
        [loadingOverlay show:@"Saving ..."];