自定义 UIBarButtonItem 与 iOS7 对齐 [英] Custom UIBarButtonItem alignment off with iOS7

问题描述

因此，在创建带有 UIButton 作为自定义视图的 UIBarButtonItem 时，我遇到了许多其他人遇到的相同问题.

So I am having the same problem that many others are experiencing when creating a UIBarButtonItem with a UIButton as a custom view.

按钮基本上离左边或右边大约 10 像素.当我使用没有自定义视图的常规 BarButtonItem 时，不会发生这种情况.

Basically the button is about 10 pixel to far either left or right. When I use a regular BarButtonItem without a custom view, this does not happen.

这篇文章提供了部分解决方案:带有自定义视图的 UIBarButton

This post provided a partial solution: UIBarButton With Custom View

这是我通过继承 UIButton 创建的代码(如另一篇文章所述)

Here is my code I have created by subclassing UIButton (as stated in the other post)

    - (UIEdgeInsets)alignmentRectInsets {
    UIEdgeInsets insets;
    if ([self isLeftButton]) {
        insets = UIEdgeInsetsMake(0, 9.0f, 0, 0);
    }
    else { // IF ITS A RIGHT BUTTON
        insets = UIEdgeInsetsMake(0, 0, 0, 9.0f);
    }
    return insets;
}


- (BOOL)isLeftButton {
    return self.frame.origin.x < (self.superview.frame.size.width / 2);
}

这很好用，但是当我从导航控制器弹出一个视图控制器回到这个主视图时，按钮仍然错误地定位了大约 0.3 秒，然后它卡入正确的插图.

This works great, but when I pop a view controller from the navigation controller back to this main view, the button is still incorrectly positioned for about .3 seconds, and then it snaps into the correct inset.

这是一个巨大的眼睛，我不知道如何阻止它像这样折断.有什么想法吗?谢谢！

This is a HUGE eyesore and I have no idea how to stop it from snapping like so. Any thoughts? Thanks!

推荐答案

我遇到了与您和许多其他人一样的问题.经过长时间的尝试修复它，我终于做到了.这是您必须包含在 *-Prefix.pch 文件中的类别.仅此而已！

I had the same problem like you and many other. After long time trying to fix it, finally I did it. This is the category you have to include in your *-Prefix.pch file. And that's all!

UINavigationItem+iOS7Spacing.h

UINavigationItem+iOS7Spacing.h

#import <Foundation/Foundation.h>
@interface UINavigationItem (iOS7Spacing)
@end

UINavigationItem+iOS7Spacing.m

UINavigationItem+iOS7Spacing.m

#import "UINavigationItem+iOS7Spacing.h"
#import <objc/runtime.h>

@implementation UINavigationItem (iOS7Spacing)

- (BOOL)isIOS7
{
    return ([[[UIDevice currentDevice] systemVersion] compare:@"7" options:NSNumericSearch] != NSOrderedAscending);
}

- (UIBarButtonItem *)spacer
{
    UIBarButtonItem *space = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
    space.width = -11;
    return space;
}

- (void)mk_setLeftBarButtonItem:(UIBarButtonItem *)leftBarButtonItem
{
    if ([self isIOS7] && leftBarButtonItem) {
        [self mk_setLeftBarButtonItem:nil];
        [self mk_setLeftBarButtonItems:@[[self spacer], leftBarButtonItem]];
    } else {
        [self mk_setLeftBarButtonItem:leftBarButtonItem];
    }
}

- (void)mk_setLeftBarButtonItems:(NSArray *)leftBarButtonItems
{
    if ([self isIOS7] && leftBarButtonItems && leftBarButtonItems.count > 0) {

        NSMutableArray *items = [[NSMutableArray alloc] initWithCapacity:leftBarButtonItems.count + 1];
        [items addObject:[self spacer]];
        [items addObjectsFromArray:leftBarButtonItems];

        [self mk_setLeftBarButtonItems:items];
    } else {
        [self mk_setLeftBarButtonItems:leftBarButtonItems];
    }
}

- (void)mk_setRightBarButtonItem:(UIBarButtonItem *)rightBarButtonItem
{
    if ([self isIOS7] && rightBarButtonItem) {
        [self mk_setRightBarButtonItem:nil];
        [self mk_setRightBarButtonItems:@[[self spacer], rightBarButtonItem]];
    } else {
        [self mk_setRightBarButtonItem:rightBarButtonItem];
    }
}

- (void)mk_setRightBarButtonItems:(NSArray *)rightBarButtonItems
{
    if ([self isIOS7] && rightBarButtonItems && rightBarButtonItems.count > 0) {

        NSMutableArray *items = [[NSMutableArray alloc] initWithCapacity:rightBarButtonItems.count + 1];
        [items addObject:[self spacer]];
        [items addObjectsFromArray:rightBarButtonItems];

        [self mk_setRightBarButtonItems:items];
    } else {
        [self mk_setRightBarButtonItems:rightBarButtonItems];
    }
}

+ (void)mk_swizzle:(SEL)aSelector
{
    SEL bSelector = NSSelectorFromString([NSString stringWithFormat:@"mk_%@", NSStringFromSelector(aSelector)]);

    Method m1 = class_getInstanceMethod(self, aSelector);
    Method m2 = class_getInstanceMethod(self, bSelector);

    method_exchangeImplementations(m1, m2);
}

+ (void)load
{
    [self mk_swizzle:@selector(setLeftBarButtonItem:)];
    [self mk_swizzle:@selector(setLeftBarButtonItems:)];
    [self mk_swizzle:@selector(setRightBarButtonItem:)];
    [self mk_swizzle:@selector(setRightBarButtonItems:)];
}

@end

GitHub 上的 UINavigationItem+iOS7Spacing 类别

这篇关于自定义 UIBarButtonItem 与 iOS7 对齐的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！