得到错误NSInternalInconsistencyException“参数必须是非零”

Question

我运行此代码：

- (void)unitButtonButtonTapped:(id)sender { 
    [_label setString:@"Last button: Unembossed square"]; 
    MilitaryUnits *target = nil; 
    target = [Peasants militaryUnits]; 
    target.position = ccp(100, 450); 
    [self addChild:target]; 
} 

而且我得到这个错误： *终止应用程序由于未捕获的异常“NSInternalInconsistencyException”，原因：“参数必须是非零”

这是我的.h和.M类文件

#import "cocos2d.h" 

@interface MilitaryUnits : CCSprite { 
    int _experience; 
    int _number_of_units; 
    int _stamina; 
    int _armor_level; 
    int _weapon_levell; 
} 

@property (nonatomic, assign) int experience; 
@property (nonatomic, assign) int number_of_units; 
@property (nonatomic, assign) int stamina; 
@property (nonatomic, assign) int armor_level; 
@property (nonatomic, assign) int weapon_levell; 

@end 

@interface Peasants : MilitaryUnits{ 

} 
+(id)militaryUnits; 

@end 

#import "MilitaryUnits.h" 

@implementation MilitaryUnits 

@synthesize number_of_units = _number_of_units; 
@synthesize stamina = _stamina; 
@synthesize experience = _experience; 
@synthesize armor_level = _armor_level; 
@synthesize weapon_levell = _weapon_levell; 

@end 

@implementation Peasants 

+ (id)militaryUnits { 

    Peasants *militaryUnits = nil; 
    if ((militaryUnits = [[[super alloc] initWithFile:@"Target.png"] autorelease])) { 
    } 
    return militaryUnits; 

} 

@end 

注意，我USI ng cocos 2d

Answer 1

在我看来，像你的精灵是零，即没有找到文件“Target.png”。确保文件名与您在代码中阐述的相同（在finder中），并且该文件包含在Xcode中目标的成员资格中。

而且

+ (id)militaryUnits { 

    Peasants *militaryUnits; 
    if ((militaryUnits = [[[super alloc] initWithFile:@"Target.png"] autorelease])) { 
     return militaryUnis; 
    } else { 
     CCLOGERROR(@"your favorite whine style for errors like file not found"); 
     return nil; 
    } 
}