私は現在、「ビッグオタク牧場」の本でObjective-cを学んでいます。第18章のコードを繰り返しましたが、エラーが発生します。xcodeの64ビットmacos10.6witch実際バージョンを使用します。
コンパイラは言う：
ターゲットBMITimeを構築する
CompileC /Users/pm/Library/Developer/Xcode/DerivedData/BMITime-cjqpmtvlmdoeiecyxbofznzjgpij/Build/Intermediates/BMITime.build/Debug/BMITime.build/Objects-normal/x86_64/main.o BMITime / main.m normalx86_64objective- c com.apple.compilers.llvm.clang.1_0.compiler cd / Users / pm / Dropbox / objective-c / BMITime setenv LANGen_US.US-ASCII/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault。xctoolchain / usr / bin / clang -x Objective-c -arch x86_64 -fmessage-length = 0 -std = gnu99 -fobjc-arc -Wno-trigraphs -fpascal-strings -O0 -Wno-missing-field-initializers -Wno- missing-prototypes -Wreturn-type -Wno-implicit-atomic-properties -Wformat -Wno-missing-braces -Wparentheses -Wswitch -Wno-unused-function -Wno-unused-label -Wno-unused-parameter -Wunused-variable- Wunused-value -Wuninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants -Wno-sign-compare -Wshorten-64-to-32 -Wpointer-sign -Wno-newline-eof -Wno-セレクター-Wno-strict-selector-match-Wno-undeclared-selector-Wno-deprecated-implements -DDEBUG = 1-isysroot/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10。 7.sdk -fasm-blocks -Wprotocol -Wdeprecated-declarations -mmacosx-version-min=10。7 -g -Wno-conversion -Wno-sign-conversion "-DIBOutlet =属性（（iboutlet）） "" -DIBOutletCollection（ClassName）=属性（（iboutletcollection（ClassName））） "" -DIBAction = void）属性（（ibaction） "-iquote /Users/pm/Library/Developer/Xcode/DerivedData/BMITime-cjqpmtvlmdoeiecyxbofznzjgpij/Build/Intermediates/BMITime.build/Debug/BMITime.build/BMITime-generated-files.hmap -I / Users / pm / Library / Developer / Xcode / DerivedData / BMITime-cjqpmtvlmdoeiecyxbofznzjgpij / Build / Intermediates / BMITime.build / Debug / BMITime.build / BMITime-own-target-headers.hmap -I / Users / pm / Library / Developer / Xcode / DerivedData / BMITime-cjqpmtvlmdoeiecyxbofznzjgpij / Build / Intermediates / BMITime.build / Debug / BMITime.build / BMITime-all-target-headers.hmap -iquote /Users/pm/Library/Developer/Xcode/DerivedData/BMITime-cjqpmtvlmdoe中級者/BMITime.build/Debug/BMITime.build/BMITime-project-headers。hmap -I / Users / pm / Library / Developer / Xcode / DerivedData / BMITime-cjqpmtvlmdoeiecyxbofznzjgpij / Build / Products / Debug / include -I / Users / pm / Library / Developer / Xcode / DerivedData / BMITime-cjqpmtvlmdoeiecyxbofznzjgp BMITime.build / Debug / BMITime.build / DerivedSources / x86_64 -I / Users / pm / Library / Developer / Xcode / DerivedData / BMITime-cjqpmtvlmdoeiecyxbofznzjgpij / Build / Intermediates / BMITime.build / Debug / BMITime.build / DerivedSources -F / Users / pm / Library / Developer / Xcode / DerivedData / BMITime-cjqpmtvlmdoeiecyxbofznzjgpij / Build / Products / Debug -include / Users / pm / Library / Developer / Xcode / DerivedData / BMITime-cjqpmtvlmdoeiecyxbofznzjgpij / Build / Intermediates / Pre bbjacqhmgaerfrhblktcvkpzzntb/BMITime-プレフィックス。pch-MMD-MT依存関係-MF/Users/pm/Library/Developer/Xcode/DerivedData/BMITime-cjqpmtvlmdoeiecyxbofznzjgpij/Build/Intermediates/BMITime.build/Debug/BMITime.build/Objects-normal/x86_64/main.d- serialize-diagnostics /Users/pm/Library/Developer/Xcode/DerivedData/BMITime-cjqpmtvlmdoeiecyxbofznzjgpij/Build/Intermediates/BMITime.build/Debug/BMITime.build/Objects-normal/x86_64/main.dia -c / Users / pm / Dropbox / Objective-c / BMITime / BMITime / main.m -o /Users/pm/Library/Developer/Xcode/DerivedData/BMITime-cjqpmtvlmdoeiecyxbofznzjgpij/Build/Intermediates/BMITime.build/Debug/BMITime.build/Objects-normal/ x86_64 / main.obuild / Objects-normal / x86_64 / main.dia -c /Users/pm/Dropbox/objective-c/BMITime/BMITime/main.m -o /Users/pm/Library/Developer/Xcode/DerivedData/BMITime-cjqpmtvlmdoeiecyxbofznzjgpij/ Build / Intermediates / BMITime.build / Debug / BMITime.build / Objects-normal / x86_64 / main.obuild / Objects-normal / x86_64 / main.dia -c /Users/pm/Dropbox/objective-c/BMITime/BMITime/main.m -o /Users/pm/Library/Developer/Xcode/DerivedData/BMITime-cjqpmtvlmdoeiecyxbofznzjgpij/ Build / Intermediates / BMITime.build / Debug / BMITime.build / Objects-normal / x86_64 / main.o
/Users/pm/Dropbox/objective-c/BMITime/BMITime/main.m:21:10：エラー：'Employee'の表示された@interfaceがセレクターを宣言していません'setWeightInKilos：'[person setWeightInKilos：96]; ^ /Users/pm/Dropbox/objective-c/BMITime/BMITime/main.m:22:10：エラー：'Employee'の表示された@interfaceがセレクターを宣言していません'setHeightInMeters：'[person setHeightInMeters：1.8]; ^ /Users/pm/Dropbox/objective-c/BMITime/BMITime/main.m:26:22：エラー：'Employee'の表示された@interfaceがセレクター'bodyMassIndex'を宣言していませんfloatbmi = [person bodyMassIndex]; ^3つのエラーが生成されました。
私のコードは次のようになります：
main.m
#import <Foundation/Foundation.h>
#import "Employee.h"
int main(int argc, const char * argv[])
{
@autoreleasepool {
// Erstellt eine Instanz von Person
Employee *person = [[Employee alloc] init];
// Gibt den Instanzvariablen interessante Werte
[person setWeightInKilos:96];
[person setHeightInMeters:1.8];
[person setEmployeeID:15];
// Ruft die Methode bodyMassIndex auf
float bmi = [person bodyMassIndex];
NSLog(@"Employee %d has a BMI of %f", [person employeeID], bmi);
}
return 0;
}
Person.h
#import <Foundation/Foundation.h>
// Die Klasse Person erbt alle Instanzvariablen
// und Methoden, die von der Klasse NSObject definiert wurden
@interface Person : NSObject
{
// Sie hat zwei Instanzvariablen
float heightInMeters;
int weightInKilos;
}
@property float heightInMeters;
@property int weightInKilos;
// Diese Methode berechnet den Body-Mass-Index
- (float)bodyMassIndex;
@end
Employee.h
#import <Foundation/Foundation.h>
#import "Person.h"
@interface Employee : NSObject
{
int employeeID;
}
@property int employeeID;
@end
Employee.m
#import "Employee.h"
@implementation Employee
@synthesize employeeID;
@end
Person.m
#import "Person.h"
@implementation Person
@synthesize heightInMeters, weightInKilos;
- (float)bodyMassIndex
{
//return weightInKilos / (heightInMeters * heightInMeters);
float h = [self heightInMeters];
return [self weightInKilos] / (h * h);
}
@end