iOS导航BarButtonItem文字或者图片与屏幕边界的间隔调整方法

先谢谢标哥啦 /article/1513932.html

在设置navigationItem的leftBarButtonItem或rightBarButtonItem时，

用CustomView初始化UIBarButtonItem，不论怎么设置CustomView的frame，

添加到导航条上之后总是和屏幕边界有一定的间距（5pix），

如何自由调整这个间距呢？

下面介绍两种方法：

1、不用直接设置rightBartButtonItem而是设置rightBartButtonItems，并且第一个item设置为一个占位。

[objc] view
plaincopyprint?





- (UIButton *)addRightItemWithTitle:(NSString *)title action:(SEL)action {

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

CGSize size = [title sizeWithFont:[UIFont systemFontOfSize:16]];

//! 这里需要根据内容大小来调整宽度

button.frame = CGRectMake(0, 0, size.width <= 10 ? 70 : size.width + 10, 44);

button.titleLabel.textColor = [UIColor whiteColor];

button.titleLabel.font = [UIFont systemFontOfSize:16];

button.titleLabel.textAlignment = NSTextAlignmentRight;

[button setTitle:title forState:UIControlStateNormal];

/**

* width为负数时，相当于btn向右移动width数值个像素，由于按钮本身和边界间距为5pix，所以width设为-15时，间距正好调整

* 为10；width为正数时，正好相反，相当于往左移动width数值个像素

*/

UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc]

initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace

target:nil action:nil];

negativeSpacer.width = -15;

[button addTarget:self action:action forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithCustomView:button];

self.navigationItem.rightBarButtonItems = @[negativeSpacer, backItem];

return button;

}

2、如果是只有图片，那么通过设置

[button setImageEdgeInsets:UIEdgeInsetsMake(0, -15, 0, -15)];这样也可以调整

[objc] view
plaincopyprint?





- (UIButton *)addRightItemWithImage:(NSString *)imageName action:(SEL)action {

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

UIImage *image = [UIImage imageNamed:imageName];

button.frame = CGRectMake(0, 0, image.size.width, image.size.height);

// 这里需要注意：由于是想让图片右移，所以left需要设置为正，right需要设置为负。正在是相反的。

// 让按钮图片右移15

[button setImageEdgeInsets:UIEdgeInsetsMake(0, 15, 0, -15)];

[button setImage:image forState:UIControlStateNormal];

[button addTarget:self action:action forControlEvents:UIControlEventTouchUpInside];

button.titleLabel.font = [UIFont systemFontOfSize:16];

UIBarButtonItem *rightItem = [[UIBarButtonItem alloc] initWithCustomView:button];

self.navigationItem.rightBarButtonItem = rightItem;

return button;