Question

我正在尝试使用字符串，int和浮点数来为Objective C使用getter setter类。但是当涉及到执行时，它表明存在通过引用从该行传递的变量的错误访问：

[self setState:valueState];

Applpication Part：

  CheckPoints *myCar=[[CheckPoints alloc] init];
    [myCar setState:1];
    [myCar setLatitude:12.12312313];
    [myCar setLongitude:123.12312312313];
     NSString *theTextValue = @"Destination";
    [myCar setDesp:theTextValue];

以下是我的代码：

Checkpoints.m

#import "CheckPoints.h"

@implementation CheckPoints

@synthesize desp = _desp;
@synthesize latitude = _latitude;
@synthesize longitude = _longitude;
@synthesize state = _state;


- (NSString *) getDesp
{
    return desp;
}

- (float *) getLatitude
{
    return latitude;
}

- (float *) getLongitude
{
    return longitude;
}

- (int *) getState
{
    return state;
}

- (void)setDesp:(NSString *)valueDesp {
    [self setDesp:valueDesp];
}

- (void)setLatitude:(float )valueLatitude {
  //  self.latitude = valueLatitude;
    [self setLatitude:valueLatitude];
}

- (void)setLongitude:(float )valueLongitude {
    [self setLongitude:valueLongitude];
}

- (void)setState:(int )valueState {
    [self setState:valueState];  <---this segment
}

@end

Checkpoints.h

#import <GoogleMaps/GoogleMaps.h>
#import <Foundation/Foundation.h>

@interface CheckPoints : NSObject<CLLocationManagerDelegate> {

    NSString *desp;
    float* latitude;
    float* longitude;
    int* state;
}


@property (nonatomic, strong) NSString* desp;
@property  (nonatomic, assign) float* latitude;
@property  (nonatomic, assign) float* longitude;
@property  (nonatomic, assign) int* state;

- (NSString *)getDesp;
- (float *)getLatitude;
- (float *)getLongitude;
- (int *)getState;

- (void)setDesp:(NSString *)valueDesp;
- (void)setLatitude:(float )valueLatitude;
- (void)setLongitude:(float )valueLongitude;
- (void)setState:(int )valueState;

@end

Answer 1

你在这里做了一个无限循环。在setter中，您应该在实例变量中设置值。您正在从setter方法的主体再次调用setter方法。因此，它将创建一个无限循环。这将超出您的堆栈，您的应用程序将崩溃。请参阅下面的代码，以使您的setter方法正确。

- (void)setState:(int )valueState {
    _state = valueState;
}

以相同的方式修改其他setter方法。

IOS Getter Setter无法申请Google Map

1 个答案: