IOS7 UI compatible navigation bar button margins

The UI before IOS7 is:

In IOS7, for design reasons, the UI becomes:

The modified method overrides Uinavigationitem 's setleftbarbuttonitem and Setrightbarbuttonitem methods to make it compatible with previous versions;

The code is as follows:

@interface Uinavigationitem (margin) @end

@implementationUinavigationitem (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= - A; 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= - A; if(_rightbarbuttonitem) {[Self setrightbarbuttonitems:@[negativeseperator, _rightbarbuttonitem]]; }        Else{[self setrightbarbuttonitems:@[negativeseperator]];    } [Negativeseperator release]; }    Else{[self setrightbarbuttonitem:_rightbarbuttonitem animated:no]; }}#endif@end

Project source code does not make any changes, problem solving;

To add a button:

Uibarbuttonitem *leftbaritem == leftbaritem;[ Leftbaritem release];