UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];//button的類型?

button.frame = CGRectMake(100, 100,90, 90);//button的frame?

button.backgroundColor = [UIColor cyanColor];//button的背景顏色?

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// [button setBackgroundImage:[UIImage imageNamed:@"man_64.png"] forState:UIControlStateNormal];?

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// 在UIButton中有三個對EdgeInsets的設置：ContentEdgeInsets、titleEdgeInsets、imageEdgeInsets?

[button setImage:[UIImage imageNamed:@"IconHome@2x.png"] forState:UIControlStateNormal];//給button添加image?

button.imageEdgeInsets = UIEdgeInsetsMake(5,13,21,button.titleLabel.bounds.size.width);//設置image在button上的位置（上top，左left，下bottom，右right）這里可以寫負值，對上寫－5，那么image就象上移動5個像素?

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[button setTitle:@"首頁" forState:UIControlStateNormal];//設置button的title?

button.titleLabel.font = [UIFont systemFontOfSize:16];//title字體大小?

button.titleLabel.textAlignment = NSTextAlignmentCenter;//設置title的字體居中?

[button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];//設置title在一般情況下為白色字體?

[button setTitleColor:[UIColor grayColor] forState:UIControlStateHighlighted];//設置title在button被選中情況下為灰色字體?

button.titleEdgeInsets = UIEdgeInsetsMake(71, -button.titleLabel.bounds.size.width-50, 0, 0);//設置title在button上的位置（上top，左left，下bottom，右right）?

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// [button setContentEdgeInsets:UIEdgeInsetsMake(70, 0, 0, 0)];//?

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// button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;//設置button的內容橫向居中。。設置content是title和image一起變化?

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[button addTarget:self action:@selector(tap) forControlEvents:UIControlEventTouchUpInside];?