實現Button文字(titleLabel)和圖片(imageView)上下排列

利用 Button自帶的titleLabel和imageView，用來設置label和image的排列方式，eg：上下、左右 UIEdgeInsetsMake

裏面的四個參數表示距離上邊界、左邊界、下邊界、右邊界的距離，默認都爲零，title／image在button的正中央

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

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

// 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）這裏能夠寫負值，對上寫－5，那麼image就象上移動5個像素

[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在通常狀況下爲白色字體 [button setTitleColor:[UIColor grayColor] forState:UIControlStateHighlighted];//設置title在button被選中狀況下爲灰色字體 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） 

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

// button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;//設置button的內容橫向居中。。設置content是title和image一塊兒變化

[button addTarget:self action:@selector(tap) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button]; 

[objc]
//button相應的事件
-(void)tap {
NSLog(@"tap a button");

UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"hello" message:@"willingseal" delegate:self cancelButtonTitle:@"ok" otherButtonTitles: nil nil]; [alertView show]; 

}