ios7中得导航栏按钮相对于ios7之前的版本会出现12个像素左右的偏移,这使得很多UI不是那么协调了。为了解决一个问题,
重写UINavigationItem的setLeftBarButtonItem和setRightBarButtonItem方法,使之与之前版本兼容;
代码如下:
@interface UINavigationItem (margin)
@end
@implementation UINavigationItem (margin)
if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_6_1
(void)setLeftBarButtonItem:(UIBarButtonItem *)_leftBarButtonItem
{
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)
{
UIBarButtonItem *negativeSeperator = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
negativeSeperator.width = -12;if (_leftBarButtonItem) { [self setLeftBarButtonItems:@[negativeSeperator, _leftBarButtonItem]]; } else { [self setLeftBarButtonItems:@[negativeSeperator]]; } [negativeSeperator release];
}
else
{
[self setLeftBarButtonItem:_leftBarButtonItem animated:NO];
}
}(void)setRightBarButtonItem:(UIBarButtonItem *)_rightBarButtonItem
{
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)
{
UIBarButtonItem *negativeSeperator = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
negativeSeperator.width = -12;if (_rightBarButtonItem) { [self setRightBarButtonItems:@[negativeSeperator, _rightBarButtonItem]]; } else { [self setRightBarButtonItems:@[negativeSeperator]]; } [negativeSeperator release];
}
else
{
[self setRightBarButtonItem:_rightBarButtonItem animated:NO];
}
}
endif
@end
项目源码不做任何修改,问题解决;
添加Button:
UIBarButtonItem *leftBarItem = [[UIBarButtonItem alloc] initWithCustomView:btnBack];
self.navigationItem.leftBarButtonItem = leftBarItem;
[leftBarItem release];