字符串的创建
NSString *str1 = [NSString stringWithFormat:@"%s","hello world"];
NSString *str2 = [NSString stringWithUTF8String:"hello world"];
NSString *str1 = [NSString stringWithFormat:@"%s","hello world"];
NSString *str2 = [NSString stringWithUTF8String:"hello world"];
本文标题:NSString - OC
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