项目中遇到的问题解决：深刻认识到类的初始化

-(NSArray *)getdataFromDatabase
{
NSString *path = [self getDBPath];
NSLog(@"path ==== %@",path);
NSLog(@"self.getDBPath == %@",[self getDBPath]);

FMDatabase *membersDB = [FMDatabase databaseWithPath:path];
if (![membersDB open]) {
NSLog(@"Failed to open membersDB");
return nil;
[membersDB close];
}
NSMutableArray *array = [NSMutableArray array];
FMResultSet *rs = [membersDB executeQuery:@"SELECT * FROM Member"];//这里数组为空  容易出错
<pre name="code" class="objc">    <span style="color:#FF0000;">
Member *member = [[Member alloc]init];
while ([rs next])
 { member.name = [rs stringForColumn:@"Name"];
member.age = [rs intForColumn:@"Age"];
member.sex = [rs intForColumn:@"Sex"];
 member.height = [rs intForColumn:@"Height"]; member.Weight = [rs intForColumn:@"Weight"];
 member.icon = [UIImage imageWithData:[rs dataForColumn:@"Photo"]];
NSLog(@"member.name =============  %@",member.name);
     [array addObject:member];</span>
}
[membersDB close];<span style="color:#FF0000;">
 NSLog(@"array[0] == %@,\narray[1] == %@,\narray[2]==%@",[array[0] name],[array[1] name],[array[2] name]);</span>
 return [array copy];
}

</span>

打印信息如下：



在while循环中打印是正确的，不重复的，可以循环结束在打印我们添加成员的数组，发现都是重复的，也就是都是同一个对象！！！！

泪奔啊。。。。。。这时对类的理解不深刻啊，我在循环外加的 Member *member = [[Member alloc]init];初始化，也就是说再循环中我一直在对同一个对象进行重复操作，

，以至于添加成员的数组都是同一个对象，不同的个数而已。

所以解决办法应该是在循环中初始化，这样一来，每次循环都是一个新的对象（内存地址），这样一来就正确了！！！

-(NSArray *)getdataFromDatabase
{
NSString *path = [self getDBPath];
NSLog(@"path ==== %@",path);
NSLog(@"self.getDBPath == %@",[self getDBPath]);

FMDatabase *membersDB = [FMDatabase databaseWithPath:path];
if (![membersDB open]) {
NSLog(@"Failed to open membersDB");
return nil;
[membersDB close];
}
NSMutableArray *array = [NSMutableArray array];
FMResultSet *rs = [membersDB executeQuery:@"SELECT * FROM Member"];//这里数组为空  容易出错

while ([rs next])
{
<pre name="code" class="objc">     <span style="color:#FF0000;">Member *member = [[Member alloc]init];</span>

member.name = [rs stringForColumn:@"Name"];
member.age = [rs intForColumn:@"Age"];
member.sex = [rs intForColumn:@"Sex"];
 member.height = [rs intForColumn:@"Height"]; member.Weight = [rs intForColumn:@"Weight"];
 member.icon = [UIImage imageWithData:[rs dataForColumn:@"Photo"]];
NSLog(@"member.name =============  %@",member.name);
     [array addObject:member];</span>
}
[membersDB close];<span style="color:#FF0000;">
 NSLog(@"array[0] == %@,\narray[1] == %@,\narray[2]==%@",[array[0] name],[array[1] name],[array[2] name]);</span>
 return [array copy];
}

 <pre name="code" class="objc"><pre name="code" class="objc"> <span style="color:#FF0000;"></span>