iOS --自定义导航栏

自定义导航栏 JPNavigationBar，继承UINavigationBar

#import "JPNavigationBar.h"#import "JPNavigationLeftItem.h" // 自定义类继承UIButton#import "JPNavigationRightItem.h" // 自定义类继承UIButton#import "UIView+Frame.h"  // 分类，快速修改frame#define KMargin 8@implementation JPNavigationBar- (void)layoutSubviews{
[super layoutSubviews];    for (UIView *view in self.subviews) {        // 1、设置导航左边按钮的间距
if ([view isKindOfClass:[JPNavigationLeftButton class]]) {
view.x = KMargin;
}        // 2、设置导航按钮右边按钮的间距
if ([view isKindOfClass:[JPNavigationRightButton class]]) {
view.x = self.width - KMargin - view.width;
}
}

#import "JPNavigationBar.h"@implementation JPNavigationBar/**
*  调整子控件布局
*/- (void)layoutSubviews
{
[super layoutSubviews];    for (UIButton *button in self.subviews) {        if (![button isKindOfClass:[UIButton class]]) continue;        if (button.centerX < self.width * 0.5) { // 左边的按钮
button.x = 0;
} else if (button.centerX > self.width * 0.5) { // 右边的按钮
button.x = self.width - button.width;
}
}
}@end