ios - 将 double 传递给 Viewcontroller，然后传递给 UIView

Question

完整代码

ViewController.h

#import <UIKit/UIKit.h>

@interface ViewControllerImage : UIViewController {
    IBOutlet UILabel *datum;
    IBOutlet UILabel *debug;
}

@property (nonatomic, assign) double thicknessValue1;
@property (nonatomic, assign) double capWidthValue1;
@end

ViewController.m

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [datum setTransform:CGAffineTransformMakeRotation(M_PI / 2)];

    NSString *value =  [[NSString alloc] initWithFormat:@"%f", self.thicknessValue1];

    debug.text = value;

    draw2D *myView = [[draw2D alloc]initWithThickness: self.thicknessValue1 andCapWidth: self.capWidthValue1];

    NSLog(@"First Logs");
    NSLog(@"%f",myView.thicknessValue2);
    NSLog(@"%f",myView.capWidthValue2);
    NSLog(@"END FIRST LOGS");
}

draw2D.h #导入

@interface draw2D : UIView 

- (id)initWithThickness:(double)thickness andCapWidth:(double)capWith;


@property (nonatomic, assign) double thicknessValue2;
@property (nonatomic, assign) double capWidthValue2;

@end

draw2D.m

#import <UIKit/UIKit.h>

@interface draw2D : UIView 

- (id)initWithThickness:(double)thickness andCapWidth:(double)capWith
{
    self = [super init];
    if(self)
    {
        thicknessValue2 = self.thicknessValue2;
        capWidthValue2 = self.capWidthValue2;
        NSLog(@"Second Logs");
        NSLog(@"%f",thicknessValue2);
        NSLog(@"%f",capWidthValue2);
        NSLog(@"END Second LOGS");
    }
    return self;
}



@end

我已经为您提供了第二个 View Controller 和 UIView 的完整代码，我希望您能看到我哪里出错了。或者向我解释我做错了什么。

Answer 1

我正在添加另一个答案，因为之前的答案已经太长了。

伙计，我 body 上不能做更多的事情，它一点也不复杂。很抱歉，没有在网上找到有关创建对象的信息是不正确的，它几乎无处不在。我在哪里学的？

2个注意事项。

1. 命名约定表示类以大写字母开头，例如draw2d 需要是 Draw2d

2. 您不应该将变量命名为 xxx1、xxx2 等。如果它们是同一事物，请将它们命名为同一事物。如果他们是不同的类(class)也没关系。

代码:

在 View Controller 中:

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSLog(@"Before init");
    Draw2d *myView = [[Draw2d alloc] initWithFrame:CGRectMake(0, 0, 320, 320) thickness:15.0 capwidth:17.5];
    NSLog(@"After init");
    [self.view addSubview:myView];
    NSLog(@"After placing on superview at x= 0, y = 0, width = 320, height = 320");
}

Draw2d.h

#import <UIKit/UIKit.h>

@interface Draw2d : UIView

@property (nonatomic, assign) double thickness;
@property (nonatomic, assign) double capWidth;

- (id)initWithFrame:(CGRect)frame thickness:(double)thickness capwidth:(double)capWidth;

@end

Draw2d.m

#import "Draw2d.h"

@implementation Draw2d

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}

- (id)initWithFrame:(CGRect)frame thickness:(double)thickness capwidth:(double)capWidth
{
    self = [super initWithFrame:frame];
    if(self)
    {
        // Left side is property in .h
        // right side is the parameters passed into method
        self.thickness = thickness;
        self.capWidth = capWidth;
    }
    return self;
}

- (void)drawRect:(CGRect)rect
{
    NSLog(@"Passed in thickness: %f", self.thickness);
    NSLog(@"Passed in capWidth: %f", self.capWidth);
}


@end

控制台:

2014-04-16 09:23:23.613 Before init
2014-04-16 09:23:23.613 After init
2014-04-16 09:23:23.613 After placing on superview at x= 0, y = 0, width = 320, height = 320
2014-04-16 09:23:23.615 Passed in thickness: 15.000000
2014-04-16 09:23:23.616 Passed in capWidth: 17.500000