- (id)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        // Initialization code        self.tintColor = [UIColor whiteColor];    }    return self;}-(void) layoutSubviews{        UITextField *searchField;  NSUInteger numViews = [self.subviews count];  for(int i = 0; i < numViews; i++) {    if([[self.subviews objectAtIndex:i] isKindOfClass:[UITextField class]]) { //conform?      searchField = [self.subviews objectAtIndex:i];    }  }  if(!(searchField == nil)) {        searchField.placeholder = @"输入要查找的艺人的名字";        [searchField setBorderStyle:UITextBorderStyleRoundedRect];        [searchField setBackgroundColor:[UIColor whiteColor]];        //自己的搜索图标        NSString *path = [[NSBundle mainBundle] pathForResource:@"GUI_search" ofType:@"png"];        UIImage *image = [UIImage imageWithContentsOfFile:path];    UIImageView *iView = [[UIImageView alloc] initWithImage:image];        [iView setFrame:CGRectMake(0.0, 0.0, 30.0, 30.0)];    searchField.leftView = iView;  }      [super layoutSubviews];}/*// Only override drawRect: if you perform custom drawing.// An empty implementation adversely affects performance during animation.- (void)drawRect:(CGRect)rect{    // Drawing code}*/@end