举例：交换 UINavigationBar 的系统属性 titleTextAttributes
let needSwizzleSelectorArr = [
// 这里我们要交换的是属性 titleTextAttributes 的 setter 方法
#selector(setter: titleTextAttributes)
]
for selector in needSwizzleSelectorArr {
let str = ("wr_" + selector.description)
let originalMethod = class_getInstanceMethod(self, selector)
let swizzledMethod = class_getInstanceMethod(self, Selector(str))
method_exchangeImplementations(originalMethod, swizzledMethod)
}
交换的方法
func wr_setTitleTextAttributes(_ newTitleTextAttributes:[String : Any]?)
{
guard var attributes = newTitleTextAttributes else {
return
}
guard let originTitleTextAttributes = titleTextAttributes else {
wr_setTitleTextAttributes(attributes)
return
}
var titleColor:UIColor?
for attribute in originTitleTextAttributes {
if attribute.key == NSForegroundColorAttributeName {
titleColor = attribute.value as? UIColor
break
}
}
guard let originTitleColor = titleColor else {
wr_setTitleTextAttributes(attributes)
return
}
if attributes[NSForegroundColorAttributeName] == nil {
attributes.updateValue(originTitleColor, forKey: NSForegroundColorAttributeName)
}
wr_setTitleTextAttributes(attributes)
}
强烈推荐：超简单！！！ iOS设置状态栏、导航栏按钮、标题、颜色、透明度，偏移等
https://github.com/wangrui460/WRNavigationBar
https://github.com/wangrui460/WRNavigationBar_swift
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