iOS-Interview-Question-Answer
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NSMutableString *copyMutableString = [mutableCopyString copy];
NSString *string = @"测试数据"; NSString *copyString = [string copy]; NSMutableString *mutableCopyString = [string mutableCopy]; NSMutableString *copyMutableString = [string copy]; NSLog(@"%p,%p,%p,%p", string, copyString, mutableCopyString, copyMutableString);
第三行改一下 严谨一点
NSString *string = @"测试数据"; NSString *copyString = [string copy]; NSMutableString *mutableCopyString = [string mutableCopy]; NSMutableString *copyMutableString = [mutableCopyString copy]; NSLog(@"%p,%p,%p,%p", string, copyString, mutableCopyString, copyMutableString);