修改searchBar 右边的cancle键，改成“确定”

unsigned int count = 0;

Ivar *members = class_copyIvarList([UISearchBar class], &count);

for (int i = 0 ; i < count; i++) {

Ivar var = members[i];

const char *memberName = ivar_getName(var);

const char *memberType = ivar_getTypeEncoding(var);

Ivar m_name = members[2];

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

object_setIvar(_search, m_name, button);

[button setTitle:@"确认" forState:UIControlStateNormal];

NSLog(@"%s----%s", memberName, memberType);

}