UI 常用（UIButton）

1.手势

 UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(serarchBtnClicked)];
    [searchView addGestureRecognizer:tap];

2.判断系统

  if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0) {

    }

3.UIButton

    _toolbarPOIButton = [UIButton buttonWithType:UIButtonTypeCustom];
    _toolbarPOIButton.size = CGSizeMake(88, 26);
    _toolbarPOIButton.centerY = 35 / 2.0;
    _toolbarPOIButton.left = 5;
    _toolbarPOIButton.clipsToBounds = YES;
    _toolbarPOIButton.layer.cornerRadius = _toolbarPOIButton.height / 2;
    _toolbarPOIButton.layer.borderColor = UIColorHex(e4e4e4).CGColor;
    _toolbarPOIButton.layer.borderWidth = 1;
    _toolbarPOIButton.titleLabel.font = [UIFont systemFontOfSize:14];
    _toolbarPOIButton.adjustsImageWhenHighlighted = NO;
    [_toolbarPOIButton setTitle:@"显示位置 " forState:UIControlStateNormal];
    [_toolbarPOIButton setTitleColor:UIColorHex(939393) forState:UIControlStateNormal];
    [_toolbarPOIButton setImage:[WBStatusHelper imageNamed:@"compose_locatebutton_ready"] forState:UIControlStateNormal];
    [_toolbarPOIButton setBackgroundImage:[UIImage imageWithColor:UIColorHex(f8f8f8)] forState:UIControlStateNormal];
    [_toolbarPOIButton setBackgroundImage:[UIImage imageWithColor:UIColorHex(e0e0e0)] forState:UIControlStateHighlighted];
    [_toolbar addSubview:_toolbarPOIButton];

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