1、iOS11以下设置navigationItem的边距
UIView *backView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 44, 44)];
backView.backgroundColor = [UIColor magentaColor];
UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithCustomView:backView];
// 用于控制间距的item
UIBarButtonItem *spaceItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
/**
* width为负数时相当于向左移动width数值的距离,为正数时相当于向右移动width数值的距离
* 自己测了下,左边应该是16px,右边应该是12px
*/
spaceItem.width = -15;
self.navigationItem.leftBarButtonItems = @[spaceItem,backItem];
2、iOS设置navigationItem的边距
- (void)viewDidLoad {
[super viewDidLoad];
UIView *backView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 44, 44)];
UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
backButton.frame = CGRectMake(0, 0, 44, 44);
[backButton setImage:[UIImage imageNamed:@"navigation_back"] forState:UIControlStateNormal];
[backButton addTarget:self action:@selector(backAction:) forControlEvents:UIControlEventTouchUpInside];
[backView addSubview:backButton];
if ([UIDevice currentDevice].systemVersion.floatValue >= 11.0) {
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backView];
} else {
UIBarButtonItem *spaceItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
spaceItem.width = -15;
UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithCustomView:backView];
self.navigationItem.leftBarButtonItems = @[spaceItem,backItem];
}
}
- (void)viewDidLayoutSubviews{
if ([UIDevice currentDevice].systemVersion.floatValue >= 11.0) {
UINavigationItem *item = self.navigationItem;
NSArray *array = item.leftBarButtonItems;
if (array && array.count) {
// 注意:这里设置的第一个leftBarButtonItem的customeView不能为空,也就是不要设置UIBarButtonSystemItemFixedSpace这种风格的item
UIBarButtonItem *btnItem = array[0];
UIView *view = [[btnItem.customView.superview superview] superview];
NSArray *arrayConstraint = view.constraints;
for (NSLayoutConstraint *constant in arrayConstraint) {
CGFloat space = fabs(constant.constant);
// 非plus手机为16 plus手机为20
if (space == 16 || space == 20) {
constant.constant = 0;
}
}
}
}
}
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