当我调用drawRect时，UIView类属性似乎消失了：

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问题描述

我正在用xcode编写Objective-C项目。

I am coding an objective-c project with xcode.

我有两个正在使用的重要文件：一个视图控制器和一个视图。
我的视图是 PlayingCardView类，我的视图控制器是 PlayingCardGameViewController类。

I have two important files that are being used: a viewcontroller, and a view.My view is class "PlayingCardView", my viewcontroller is class: "PlayingCardGameViewController".

这是PlayingCardView.h的样子：

Here is what PlayingCardView.h looks like:

#import <UIKit/UIKit.h>

@interface PlayingCardView : UIView

@property (nonatomic) NSUInteger rank;
@property (strong, nonatomic) NSString *suit;
@property (nonatomic) BOOL faceUp;

@end

这是PlayingCardView.m中的重要代码：

Here is the important code from PlayingCardView.m :

#import "PlayingCardView.h"

@implementation PlayingCardView

-(void)setSuit:(NSString *)suit {
    NSLog(@"suit is set");
    _suit = suit;
    [self setNeedsDisplay];
}

-(void)setRank:(NSUInteger)rank {
    NSLog(@"rank is set");
    _rank = rank;
    [self setNeedsDisplay];
}

-(void)setFaceUp:(BOOL)faceUp {
    _faceUp = faceUp;
    [self setNeedsDisplay];
}

-(NSString *)rankAsString {
    return @[@"?",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10",@"J",@"Q",@"K",@"A"][self.rank];
}

- (void)drawRect:(CGRect)rect {
    NSLog(@"Calling drawRect");
    NSLog(@"%@%@",[self rankAsString],self.suit);
    // Drawing Code
}

@end

这是PlayingCardGameViewController.m的样子：

Here is what PlayingCardGameViewController.m looks like:

#import "PlayingCardGameViewController.h"

@interface PlayingCardGameViewController ()

@property (weak, nonatomic) IBOutlet PlayingCardView *playingCardView;

@end

@implementation PlayingCardGameViewController

-(void)viewDidLoad {
    NSLog(@"Calling view did load");
    [super viewDidLoad];
    self.playingCardView.suit = @"♥︎";
    self.playingCardView.rank = 13;
}

@end

我包括了一些NSLog来查看所谓的顺序以及发生的事情。打印内容如下：

I included some NSLog's to see the order of what is called, and what is happening. Here is what is printed out:

从本质上讲，这告诉我的是第一个viewDidLoad被调用。西装和等级已设置，就像它们在viewDidLoad中设置的一样。然后调用drawRect。现在，当我要求返回西服和等级时，我得到一个空字符串和一个零值整数。我不知道发生了什么，但它似乎在viewDidLoad和drawRect之间的某个位置丢失了。

Essentially what this is telling me is first viewDidLoad is called. The suit and rank are set, as they are set in viewDidLoad. Then drawRect is called. Now when I ask to return the suit and rank, I get a null string and a 0-value integer. I have no idea what is happening, but it appears somewhere between viewDidLoad and drawRect the properties are being lost.

请帮助我，我对Objective-C和Xcode还是陌生的！

Please help me, I am pretty new to objective-c and xcode! All advice is greatly appreciated.

编辑：所以我试图做一些人建议的事情，但是并没有解决问题。这是一些其他信息：接口构建器中的 PlayingCardView视图设置为 PlayingCardView类。我尝试删除IBOutlet行，并执行另一个ctl + drag来重新创建IBOutlet。

edit: So I have tried to do a few things people suggested, which did not solve the problem. Here is some additional information: The PlayingCardView view in interface builder is set to class PlayingCardView. I tried deleting the IBOutlet line and doing another ctl+drag to recreate the IBOutlet. Nothing has worked so far.

当我调用drawRect时

当我调用drawRect时，UIView类属性似乎消失了：

问题描述

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