+(UIBarButtonItem *)backButtonWithTitle:(NSString *)title titleColor:(UIColor *)color imageName:(NSString *)imageName target:(id)target action:(SEL)action{        UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];        [button setTitleColor:color forState:UIControlStateNormal];    [button setTitle:title forState:UIControlStateNormal];    button.titleLabel.font = [UIFont boldSystemFontOfSize:15];        [button setImage:[[UIImage imageNamed:imageName] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] forState:UIControlStateNormal];    [button setImage:[[UIImage imageNamed:[NSString stringWithFormat:@"%@_selected", imageName]] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] forState:UIControlStateSelected];        button.imageEdgeInsets = UIEdgeInsetsMake(0, -5, 0, 0);        [button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];    paragraphStyle.lineBreakMode = NSLineBreakByTruncatingTail;//省略方式 ...在后面         NSDictionary *attributes = @{                                 NSParagraphStyleAttributeName : paragraphStyle,                                 };    button.titleLabel.attributedText = [[NSAttributedString alloc] initWithString:title attributes: attributes];        [button sizeToFit];        //100是你想限制的最大宽度    if (button.width > 100)    {        button.width = 100;    }        return [[UIBarButtonItem alloc]initWithCustomView:button];}