iOS UIButton 自定义图片和文字位置详解

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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;}

    UIButton *button = [UIButton buttonWithType:(UIButtonTypeCustom)];    button.frame = CGRectMake(50, 50, 200, 60);    [button addTarget:self action:@selector(click:) forControlEvents:(UIControlEventTouchUpInside)];    [button setTitle:@"点击我啊" forState:(UIControlStateNormal)];    [button setTitleColor:[UIColor whiteColor] forState:(UIControlStateNormal)];    button.backgroundColor = [UIColor blackColor];    [button setImage:[UIImage imageNamed:@"icon_pass"] forState:(UIControlStateNormal)];    // 默认的是图片在左title 在右    // 1,图片在右边,title 在左边 可以调左边距 也可以调右边距//    button.imageEdgeInsets = UIEdgeInsetsMake(0,0,0,-150);// 和(0,150,0,0) 一样效果//    button.titleEdgeInsets = UIEdgeInsetsMake(0, 0, 0,50); // (0,-50,0,0) 一样效果    // 2 图片在上 title 在下面 // 具体数字可以自己调    button.imageEdgeInsets = UIEdgeInsetsMake(- 20,50,0,0);    button.titleEdgeInsets = UIEdgeInsetsMake(32, 0, 0,0);    [self.view addSubview:button];

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