?設置UIEdgeInsets
[objc]
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中有三個對EdgeInsets的設置：ContentEdgeInsets、titleEdgeInsets、imageEdgeInsets
[objc]
@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
里面的四個參數(shù)表示距離上邊界怔昨、左邊界屋确、下邊界患朱、右邊界的距離秋忙，默認都為零秸弛，title／image在button的正中央
[objc]
UIKIT_STATIC_INLINE UIEdgeInsets UIEdgeInsetsMake(CGFloat top, CGFloat left, CGFloat bottom, CGFloat right) {
UIEdgeInsets insets = {top, left, bottom, right};
return insets;
}
[objc]
self.view.backgroundColor = [UIColor blackColor];
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搪搏、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狭握，左left，下bottom疯溺，右right）這里可以寫負值论颅，對上寫－5，那么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囱嫩，左left恃疯，下bottom，右right）
//? ? [button setContentEdgeInsets:UIEdgeInsetsMake(70, 0, 0, 0)];//
//? button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;//設置button的內容橫向居中墨闲。今妄。設置content是title和image一起變化
[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];
}
