假設(shè)有一個(gè)People類疯淫，有一個(gè)NSString的屬性name
@interface People: NSObject
@property (nonatomic, strong) NSString *name;
@end
然后執(zhí)行以下代碼：
People *p = [[People alloc] init];
NSMutableString *mutableS = [[NSMutableString alloc] init];
[mutableS setString:@"Lucy"];
p.name = mutableS;
NSLog(@"初始值：%@", p.name);
[mutableS setString:@"Lily"];
NSLog(@"變化后：%@", p.name);
執(zhí)行結(jié)果：
2016-07-27 10:17:53.325 Test[1242:44365] 初始值：Lucy
2016-07-27 10:17:53.326 Test[1242:44365] 變化后：Lily
