关于NSMutableArray removeObject
有三个NSString,
NSString *str1 = @"123";
NSString *str2 = [NSString stringWithFormat:@"123"];
NSMutableString *str3 = [NSMutableStringstringWithFormat:@"123"];
NSLog(@"str1 = %p , str2 = %p, str3 = %p", str1, str2, str3);
NSLog(@"str1 = %d , str2 = %d, str3 = %d", [str1 hash], [str2 hash], [str3 hash]);
打印的内存地址分别为
str1 = 0x58b0 , str2 = 0x8d376e0, str3 = 0x8d3e380
hash 值都为
487557729
NSMutableArray *array = [@[str1, str2, str3, @"1234"] mutableCopy];
[array removeObject:str1];
NSLog(@"array = %@", array);
array = (
1234
)
可以证明 removeobject 是根据hash值的映射,只要hash值相同,在NSMutableArray removeObject 的时候都会被remove掉