自定义委托没有响应iOS

我已经设置了一个代表，让他接受仪表的新旧位置。然而，我似乎无法从代表那里得到回应。我可能会错过一些东西，但我做了一系列的研究，似乎一切都井然有序

梅特维尤

#import <UIKit/UIKit.h>
#import "KTOneFingerRotationGestureRecognizer.h"

@protocol MeterViewDelegate;


@interface MeterView : UIView{

    IBOutlet UIImageView *gauge;
    IBOutlet UIImageView *needle;
    float rotation, oldPos, newPos;
    KTOneFingerRotationGestureRecognizer *rgest;
}

@property (nonatomic, weak) id<MeterViewDelegate> delegate;

- (IBAction)handleMovedNeedle;

@end

@protocol MeterViewDelegate <NSObject>

- (void)meterView:(MeterView*)view OldValue:(float)oldval NewValue:(float)newval;

@end

#导入
#导入“KToneFingerRotationGestureRecognitor.h”
@协议MeterViewDelegate；
@接口MeterView:UIView{
IBUIImageView*仪表；
IBUIImageView*针；
浮动旋转，oldPos，newPos；
KToneFingerRotationGestureRecogener*rgest；
}
@属性（非原子，弱）id委托；
-（IBAction）手柄移动针；
@结束
@协议MeterViewDelegate
-（void）meterView:（meterView*）视图OldValue:（float）oldval NewValue:（float）newval；
@结束

梅特维尤

#import "MeterView.h"
#import <QuartzCore/QuartzCore.h>


@implementation MeterView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {

    }
    return self;
}

-(void)handleMovedNeedle{
    if ([self.delegate respondsToSelector:@selector(meterView:OldValue:NewValue:)]) {
        [self.delegate meterView:self OldValue:oldPos NewValue:newPos];
    }
    else{
        NSLog(@"Delegate call FAIL, needle moved from %f, to %f", oldPos,newPos);
    }
}

-(void)awakeFromNib{

    gauge = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"gauge.png"]];
    needle = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"needle.png"]];
    needle.frame = CGRectMake(0,gauge.frame.size.height-(needle.frame.size.height/2), gauge.frame.size.width, needle.frame.size.height);

    [self addSubview:gauge];
    [self addSubview:needle];
    rotation = 0;
    rgest = [[KTOneFingerRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotate:)];
    rgest.center = CGPointMake(CGRectGetMidX([needle bounds]) + needle.frame.origin.x, CGRectGetMidY([needle bounds]) + needle.frame.origin.y);

    [self addGestureRecognizer:rgest];

}

- (void)rotate:(UIRotationGestureRecognizer *)recognizer {
    switch (recognizer.state) {
        case UIGestureRecognizerStateBegan: {
            oldPos = ([(NSNumber *)[needle.layer valueForKeyPath:@"transform.rotation.z"] floatValue]/3.14)*100;
        }
            break;
        case UIGestureRecognizerStateChanged: {

            CGFloat angle = [(NSNumber *)[needle.layer valueForKeyPath:@"transform.rotation.z"] floatValue];

            angle += [recognizer rotation];
            if (angle >= 0 && angle <= M_PI) {
                [needle setTransform:CGAffineTransformRotate([needle  transform], [recognizer rotation])];
                rotation += [recognizer rotation];
            }

        }
            break;
        case UIGestureRecognizerStateEnded: {
            newPos = ([(NSNumber *)[needle.layer valueForKeyPath:@"transform.rotation.z"] floatValue]/3.14)*100;
            [self handleMovedNeedle];

        }
            break;
        default:
            break;
    }

}

@end

#导入“MeterView.h”
#进口
@实现MeterView
-（id）initWithFrame:（CGRect）帧
{
self=[super initWithFrame:frame]；
如果（自我）{
}
回归自我；
}
-（无效）手柄移动针{
if（[self.delegate respondsToSelector:@selector（meterView:OldValue:NewValue:）]））{
[self.delegate meterView:self-OldValue:oldPos-NewValue:newPos]；
}
否则{
NSLog（@“代理调用失败，指针从%f移动到%f”，旧POS，新POS）；
}
}
-（无效）从NIB中唤醒{
gauge=[[UIImageView alloc]initWithImage:[UIImageName:@“gauge.png”]；
Pinele=[[UIImageView alloc]initWithImage:[UIImageName:@“needle.png”]；
Pinele.frame=CGRectMake（0，规格.框架.尺寸.高度-（Pinele.frame.尺寸.高度/2），规格.框架.尺寸.宽度，Pinele.frame.尺寸.高度）；
[自添加子视图：仪表]；
[自添加子视图：针]；
旋转=0；
rgest=[[ktoneFingerRotationGestureRecognitizer alloc]initWithTarget:自操作：@selector（rotate:）]；
rgest.center=CGPointMake（CGRectGetMidX（[针边界]）+针框架.origin.x，CGRectGetMidY（[针边界]）+针框架.origin.y）；
[自选地址识别器：rgest]；
}
-（无效）旋转：（ui旋转手势识别器*）识别器{
开关（识别器状态）{
案例UIgestureRecognitzerStateStart：{
oldPos=（[（NSNumber*）[pinder.layer值forkeypath:@“transform.rotation.z”]floatValue]/3.14）*100；
}
打破
案例UIgestureRecognitzerStateChanged:{
CGFloat angle=[（NSNumber*）[POINTER.layer VALUES FOKYPATH:@“transform.rotation.z”]floatValue]；
角度+=[识别器旋转]；
如果（角度>=0&&angle此代码：

secondMeter = [[MeterView alloc]initWithFrame:[[UIScreen mainScreen] bounds]];
secondMeter.delegate = self;
thirdMeter = [[MeterView alloc]initWithFrame:[[UIScreen mainScreen] bounds]];
thirdMeter.delegate =self;

创建视图的两个实例，但不会将它们添加到视图中，因此永远不会看到它们

因此，您可能有一些其他视图实例在视图中，但没有代理，这些视图有代理，但没有显示。可能是因为您有插座，所以来自XIB/故事板

使用插座将显示的视图连接到代理，而不是创建新实例

如果将视图中的委托属性设置为
IBOutlet
本身，则可以将视图控制器连接为XIB/情节提要中的委托，而不必担心代码中的委托…
一切似乎都很好。请登录手势识别器方法，查看它们是否真的被调用。查看您尝试在
MeterView.m
类中使用自动合成属性
\u delegate
而不是
self.delegate
#import "ViewController.h"
#import <QuartzCore/QuartzCore.h>

#define DEG2RAD(degrees) (degrees * 0.01745327) // degrees * pi over 180
#define RAD2DEG(radians) (radians * 57.2957795) // radians * 180 over pi

@interface ViewController ()

@end

@implementation ViewController


- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    secondMeter = [[MeterView alloc]initWithFrame:[[UIScreen mainScreen] bounds]];
    secondMeter.delegate = self;
    thirdMeter = [[MeterView alloc]initWithFrame:[[UIScreen mainScreen] bounds]];
    thirdMeter.delegate =self;
}

-(void)meterView:(MeterView *)view OldValue:(float)oldval NewValue:(float)newval{
    NSLog(@"Delegate call SUCCESS, need moved from %f, to %f", oldval,newval);
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

secondMeter = [[MeterView alloc]initWithFrame:[[UIScreen mainScreen] bounds]];
secondMeter.delegate = self;
thirdMeter = [[MeterView alloc]initWithFrame:[[UIScreen mainScreen] bounds]];
thirdMeter.delegate =self;