理解NSString比較以下兩種比較結果均為真：1)@"foo" == @"foo";2)NSString *myString1 = @"foo";NSString *myString2 = @"foo";myString1 == myString2;但是，肯定有兩次NSStringS不能使用相等運算符進行比較，并且[myString1 isEqualToString:myString2]是必需的。有人能解釋一下這件事嗎？
3 回答
互換的青春
TA貢獻1797條經驗 獲得超6個贊
==NSString@""
NSStringisEqualToString:
NSString *myString1 = @"foo";NSString *myString2 = @"foo";NSString *myString3 = [[NSString alloc] initWithString:@"foo"]; NSLog(@"%d", (myString2 == myString3)) //0NSLog(@"%d", (myString1 == myString2)); //1NSLog(@"%d", [myString1 isEqualToString:myString2]); //1NSLog(@"%d", [myString1 isEqualToString:myString3]); //1[myString3 release];
NSString *myString3 = [[NSString alloc] initWithString:@"foo"]; // this is same with @"foo"
initWithString:initWithFormat,
NSString *myString3 = [[NSString alloc] initWithFormat:@"foo"];
弒天下
TA貢獻1818條經驗 獲得超8個贊
==@""isEqual:
isEqual:isEqualToString:isEqualToString:
慕桂英546537
TA貢獻1848條經驗 獲得超10個贊
==ptr == ptr2isEqualToString
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