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//中添加觀察者

[self :self :@"" : | :@""];

//讓標題按鈕居中算法

- (void)th:( *) :(id) :( *) :(void *){

if ( == @"") {

self. = [[@"old"] ];

if (self. == self.) {

;

}

//設置按鈕選中

[self :self.];

* btn = self.[self.];

//讓選中按鈕居中

min = / 2 ;

if ( = self..count - min) {

* = self.[self..count - min - 1];

btnx = ( % 2 ) ? ..x : (..x + btn.frame.size.width * 0.5) ;

= ..x - btnx;

[ :0.25 :^{

. = (- ,0);

}];

}else if ( > min && < self..count - min && self..count > ) {

btnx = ( % 2 ) ? btn..x : (btn..x - btn.frame.size.width * 0.5) ;

= ..x - btnx;

[ :0.25 :^{

. = ( -ios 搜索關鍵字高亮ios 搜索關鍵字高亮, 0);

}];

}

} else {

[super th: : : :];

}

}