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

问题描述

所以我遇到了许多其他人在使用UIButton作为自定义视图创建UIBarButtonItem时遇到的相同问题。

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

基本上按钮大约是10像素到无论是左还是右。当我使用没有自定义视图的常规BarButtonItem时，这不会发生。

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：
UIBarButton With Custom View

This post provided a partial solution: UIBarButton With Custom View

这是我的代码我已经通过子类化UIButton创建（如另一篇文章中所述）

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，但当我从导航控制器弹回一个视图控制器时在这个主视图中，按钮仍然错误地定位了大约0.3秒，然后它进入正确的插入。

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攫取。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

我遇到了和你以及其他许多人一样的问题。经过很长时间试图解决它，最后我做到了。这是您必须包含在* -Prefix.pch文件中的类别。这就是全部！

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

这篇关于使用iOS7自定义UIBarButtonItem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！