'MLVPieChartView' 没有可见的@interface 声明选择器'tick' [关闭]

Question

这个 iOS 东西还是新手，通过教程运行，我有这个 No Visible @interface 错误，我看到了其他线程，但我也找不到答案，我查看了拼写一个 no answer。

**MLVViewController.m**
#import "MLVViewController.h"
#import "MLVPieChartView.h"
#import "MLVPieSlice.h"

@interface MLVViewController ()
{
    MLVPieChartView *pieChartView;
    NSTimer *timer;
}
@end

@implementation MLVViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    pieChartView = [[MLVPieChartView alloc] initWithFrame: self.view.frame];
    [self.view addSubview: pieChartView];


    timer = [NSTimer scheduledTimerWithTimeInterval:1/30.0 target:self selector:@selector(nextFrame) userInfo:NULL repeats:YES];

}

- (void) nextFrame
{
    [pieChartView tick];
    [pieChartView setNeedsDisplay];
}

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

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *t = [touches anyObject];
    [pieChartView touchedPoint: [t locationInView: pieChartView]];
}


@end




**MLVPieChartView.m**

#import "MLVPieChartView.h"
#import "MLVPieSlice.h" 

typedef enum
{
    STATE_IDLE,
    STATE_ROTATING,
    STATE_SEPARATING,
    STATE_SEPARATED,
    STATE_JOINING
}   state;


@implementation MLVPieChartView

{
    float xPos, yPos, radius;
    float rotationAngle;
    state animationState;
    BOOL isAnimating;
}

@synthesize pieChart;

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        pieChart = [[MLVPieChart alloc] init];
        xPos = 320/2;
        yPos = 330;
        radius = 120;
        rotationAngle = 1;

        [self setState: STATE_IDLE];
    }
    return self;
}

- (void) setState:(state) newState
{
    animationState = newState;
    switch (newState) {
        case STATE_IDLE:
            isAnimating = NO;
            break;
        case STATE_ROTATING:
            isAnimating = YES;
            break;
        case STATE_SEPARATING:
            isAnimating = YES;
            break;
        case STATE_SEPARATED:
            isAnimating = NO;
            break;
        case STATE_JOINING:
            isAnimating = YES;
            break;
    }
}

- (void) tick
{
    switch (animationState)
    {
        case STATE_ROTATING:

            break;
        case STATE_SEPARATING:

            break;
        case STATE_JOINING:

            break;
        default:
            break;
    }
}

- (void) drawRect:(CGRect)rect
{
    // Drawing code
    CGContextRef context = UIGraphicsGetCurrentContext();
    [self drawPieChart: context];
}


- (void) drawPieChart:(CGContextRef) context
{
    //clear the screen
    CGContextSetFillColorWithColor(context, [UIColor whiteColor].CGColor);
    CGContextFillRect(context, CGRectMake(0, 0, 320, 480));

    //draw all slices
    float a = rotationAngle;
    for (MLVPieSlice *slice in pieChart.slices) {
        [self drawPieSlice:slice withStartingAngle:a withContext:context];
        a += (slice.pct/100) * (M_PI * 2);
    }
}


- (void) drawPieSlice:(MLVPieSlice *) slice withStartingAngle:(float)startAngle withContext:(CGContextRef) context
{
    float endAngle = startAngle + (slice.pct / 100) * (M_PI * 2);
    float adjY = yPos;
    float rad = radius;

    CGContextSetFillColorWithColor(context, [MLVPieChartView colorFromHexString: slice.color].CGColor);
    CGContextSetStrokeColorWithColor(context, [UIColor blackColor].CGColor);
    CGContextSetLineWidth(context, 1.0);

    CGContextBeginPath(context);
    CGContextMoveToPoint(context, xPos, adjY);
    CGContextAddArc(context, xPos, adjY, rad, startAngle, endAngle, 0);
    CGContextClosePath(context);

    CGContextDrawPath(context, kCGPathFillStroke);
}

float easeInOutBack(float t, float b, float c, float d) {
    // t: current time, b: begInnIng value, c: change In value, d: duration
    float s = 1.70158;
    if ((t/-d/2) < 1) return c/2*(t*t*(((s*-(1.525))+1)*t -s)) + b;
        return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) +b;
}

float easeOutBounce(float t, float b, float c, float d) {
    if ((t/=d) < (1/2.75)) {
        return c*(7.5625*t*t) + b;
    } else if (t < (2/2.75)) {
        return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
    } else if (t < (2.5/2.75)) {
        return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
    } else {
        return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
    }
}


+ (UIColor *)colorFromHexString:(NSString *)hexString {
    unsigned rgbValue = 0;
    NSScanner *scanner = [NSScanner scannerWithString:hexString];
    [scanner scanHexInt:&rgbValue];
    return [UIColor colorWithRed:((rgbValue & 0xFF0000) >> 16)/255.0 green:((rgbValue & 0xFF00) >> 8)/255.0 blue:((rgbValue & 0xFF)/255.0) alpha:1.0];
}


@end





**MLVPieChartView.h**


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

@interface MLVPieChartView : UIView

@property MLVPieChart *pieChart;

+ (UIColor *)colorFromHexString:(NSString *)hexString;

@end

我有 GitHub 上的所有文件https://github.com/thebusiness11/animated-pie-chart

Answer 1

我正在查看 at your MLVPieChartView.h file，但我没有在其中看到名为“tick”的方法。

您需要将该调用更改为具有“tick”方法的对象。从你的 GitHub 项目中我可以看出，在任何地方都没有声明“tick”方法（在这种情况下你必须创建它）。

Answer 2

你真正需要做的是回到教程中，找到你第一次遇到问题的地方，找出你不理解的地方并清除它。

然后从教程重新开始，并完全按照说明进行操作。一旦你找到你搞砸的地方，原因应该是清楚的。

老实说，你的问题有点模糊，所以很难给出准确的答案。