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iOS導航BarButtonItem文字或者圖片與屏幕邊界的間隔調整方法
在設置navigationItem的leftBarButtonItem或rightBarButtonItem時，
用CustomView初始化UIBarButtonItem，不論怎麼設置CustomView的frame，
添加到導航條上之後總是和屏幕邊界有一定的間距（5pix），
如何自由調整這個間距呢？
下麵介紹兩種方法：
1、不用直接設置rightBartButtonItem而是設置rightBartButtonItems，並且第一個item設置為一個占位。
- (UIButton *)addRightItemWithTitle:(NSString *)title action:(SEL)action {
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
CGSize size = [title sizeWithFont:[UIFont systemFontOfSize:16]];
//! 這裏需要根據內容大小來調整寬度
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為負數時，相當於btn向右移動width數值個像素，由於按鈕本身和邊界間距為5pix，所以width設為-15時，間距正好調整
* 為10；width為正數時，正好相反，相當於往左移動width數值個像素
*/
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、如果是隻有圖片，那麼通過設置
[button setImageEdgeInsets:UIEdgeInsetsMake(0, -15, 0, -15)];這樣也可以調整
- (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);
// 這裏需要注意：由於是想讓圖片右移，所以left需要設置為正，right需要設置為負。正在是相反的。
// 讓按鈕圖片右移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;
}
最後更新：2017-04-03 12:56:27