iOS - UIButton（UIEdgeInsets）／设置button上的文字和图片上下垂直居中对齐

UIEdgeInsets

typedef struct UIEdgeInsets {CGFloat top, left, bottom, right; // specify amount to inset （positive） for each of the edges. values can be negative to "outset"} UIEdgeInsets;

在UIButton中有三个对EdgeInsets的设置：ContentEdgeInsets、titleEdgeInsets、imageEdgeInsets

@property（nonatomic） UIEdgeInsets contentEdgeInsets UI_APPEARANCE_SELECTOR; // default is UIEdgeInsetsZero@property（nonatomic） UIEdgeInsets titleEdgeInsets;// default is UIEdgeInsetsZero@property（nonatomic） BOOL reversesTitleShadowWhenHighlighted; // default is NO. if YES, shadow reverses to shift between engrave and emboss appearance@property（nonatomic） UIEdgeInsets imageEdgeInsets;// default is UIEdgeInsetsZero

UIEdgeInsetsMake
里面的四个参数表示距离上边界、左边界、下边界、右边界的距离，默认都为零，title／image在button的正中央

UIKIT_STATIC_INLINE UIEdgeInsets UIEdgeInsetsMake（CGFloat top, CGFloat left, CGFloat bottom, CGFloat right） {UIEdgeInsets insets = {top, left, bottom, right};return insets;} self.view.backgroundColor = [UIColor blackColor];UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];//button的类型button.frame = CGRectMake（100, 100,90, 90）;//button的framebutton.backgroundColor = [UIColor cyanColor];//button的背景颜色//[button setBackgroundImage:[UIImage imageNamed:@"man_64.png"] forState:UIControlStateNormal];//在UIButton中有三个对EdgeInsets的设置：ContentEdgeInsets、titleEdgeInsets、imageEdgeInsets[button setImage:[UIImage imageNamed:@"IconHome@2x.png"] forState:UIControlStateNormal];//给button添加imagebutton.imageEdgeInsets = UIEdgeInsetsMake（5,13,21,button.titleLabel.bounds.size.width）;//设置image在button上的位置（上top，左left，下bottom，右right）这里可以写负值，对上写－5，那么image就象上移动5个像素[button setTitle:@"首页" forState:UIControlStateNormal];//设置button的titlebutton.titleLabel.font = [UIFont systemFontOfSize:16];//title字体大小button.titleLabel.textAlignment = NSTextAlignmentCenter;//设置title的字体居中[button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];//设置title在一般情况下为白色字体[button setTitleColor:[UIColor grayColor] forState:UIControlStateHighlighted];//设置title在button被选中情况下为灰色字体 button.titleEdgeInsets = UIEdgeInsetsMake（71, -button.titleLabel.bounds.size.width-50, 0, 0）;//设置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;//设置button的内容横向居中。。设置content是title和image一起变化[button addTarget:self action:@selector（tap） forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:button];//button相应的事件-（void）tap {NSLog（@"tap a button"）;UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"hello" message:@"willingseal" delegate:self cancelButtonTitle:@"ok" otherButtonTitles: nil];[alertView show];}

效果图：

我这里使用的image是64*64的

－－
那就一个button，这个button的背景图片中既有图片又有文字就可以了，找个美工帮忙弄一下应该很逼真的。。。！！
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