在iOS開發(fā)中，使用UIButton設(shè)置title和p_w_picpath，達到tabBarItem的效果，即title在下，p_w_picpath在上：

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    目前，我發(fā)現(xiàn)有兩種比較好的方法：

方法一，使用UIEdgeInsets

    UIButton *button = [UIButtonbuttonWithType:UIButtonTypeSystem];

    [button setFrame:CGRectMake(100, 100, 60, 60)];

    [buttonsetBackgroundColor:[UIColorgreenColor]];

    UIImage *p_w_picpath = [UIImage p_w_picpathNamed:@"index"];

    [buttonsetTitle:@"首頁"forState:UIControlStateNormal];

    [buttonsetImage:p_w_picpathforState:UIControlStateNormal];

    // 如果不設(shè)置，則默認p_w_picpath在左，title在右，居中顯示

    // 如果如下設(shè)置，則title和p_w_picpath重疊居中顯示

    button.titleEdgeInsets = UIEdgeInsetsMake(0.0, -p_w_picpath.size.width, 0.0, 0.0);

    button.p_w_picpathEdgeInsets =UIEdgeInsetsMake(0.0,0.0,0.0, -

                button.titleLabel.bounds.size.width);

        // 如果如下設(shè)置，則title向下移動40個單位，在下，p_w_picpath向上移動20個單位，在上，居中顯示

    button.titleEdgeInsets = UIEdgeInsetsMake(40.0, -p_w_picpath.size.width, 0.0, 0.0);

    button.p_w_picpathEdgeInsets =UIEdgeInsetsMake(-20.0,0.0,0.0, -    

                button.titleLabel.bounds.size.width);

   [self.viewaddSubview:button];

方法二，重寫UIButton的layoutSubviews

- (void)layoutSubviews

{

    [superlayoutSubviews];

   CGPoint center =self.p_w_picpathView.center;

    center.x = self.frame.size.width/2;

    center.y =self.p_w_picpathView.frame.size.height/2;

    self.p_w_picpathView.center = center;

    CGRect frame = [self titleLabel].frame;

    frame.origin.x = 0;

    frame.origin.y =self.p_w_picpathView.frame.size.height +2;

    frame.size.width =self.frame.size.width;

    self.titleLabel.frame = frame;

   self.titleLabel.textAlignment =NSTextAlignmentCenter;

    [self.titleLabelsetFont:[UIFontsystemFontOfSize:10.0f]];

}