iOS-UIButton-设置button标题和图片位置

 1 - (void)createBtn3
 2 {
 3     UIImage * buttonImage = [UIImage imageNamed:@"1.jpg"];
 4     UIImage * selectedImage = [UIImage imageNamed:@"2.jpg"];
 5     CGFloat buttonImageViewWidth = CGImageGetWidth(buttonImage.CGImage);
 6     CGFloat buttonImageViewHeight = CGImageGetHeight(buttonImage.CGImage);
 7     
 8     NSString * buttonTitle = @"左图右标题";
 9     UIFont * buttonTitleFont = [UIFont systemFontOfSize:17.0f];
10     NSDictionary * attributes = @{NSFontAttributeName : buttonTitleFont};
11     CGSize buttonTitleLabelSize = [buttonTitle sizeWithAttributes:attributes];
12     
13     // button宽度,至少为imageView宽度与titleLabel宽度之和
14     CGFloat buttonWith = buttonImageViewWidth + buttonTitleLabelSize.width;
15     // button高度,至少为imageView高度与titleLabel高度之和
16     CGFloat buttonHeight = buttonImageViewHeight + buttonTitleLabelSize.height;
17     
18     UIButton * btn3 = [[UIButton alloc] init];
19     [btn3 setCenter:CGPointMake(160, 160)];
20     [btn3 setBounds:CGRectMake(0, 0, buttonWith, buttonHeight)];
21     [btn3 setBackgroundColor:[UIColor redColor]];
22     
23     [btn3.titleLabel setFont:buttonTitleFont];
24     [btn3 setImage:buttonImage forState:UIControlStateNormal];
25     
26     [btn3 setImage:selectedImage forState:UIControlStateSelected];
27     
28     [btn3 setTitle:buttonTitle forState:UIControlStateNormal];
29     
30     [btn3 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
31     
32     [btn3.titleLabel setBackgroundColor:[UIColor whiteColor]];
33     
34     [btn3 addTarget:self action:@selector(clicked:) forControlEvents:UIControlEventTouchUpInside];
35     [self.view addSubview:btn3];
36     
37 }
38 - (void)clicked:(UIButton *)btn3
39 {
40     NSLog(@"btn1被点击了");
41     NSString * buttonSelectedTitle = @"上图下标题";
42     [btn3 setTitle:buttonSelectedTitle forState:UIControlStateNormal];
43     
44     CGPoint buttonBoundsCenter = CGPointMake(CGRectGetMidX(btn3.bounds), CGRectGetMidY(btn3.bounds));
45     
46     // 找出imageView最终的center
47     CGPoint endImageViewCenter = CGPointMake(buttonBoundsCenter.x, CGRectGetMidY(btn3.imageView.bounds));
48     
49     // 找出titleLabel最终的center
50     CGPoint endTitleLabelCenter = CGPointMake(buttonBoundsCenter.x, CGRectGetHeight(btn3.bounds)-CGRectGetMidY(btn3.titleLabel.bounds));
51     
52     // 取得imageView最初的center
53     CGPoint startImageViewCenter = btn3.imageView.center;
54     
55     // 取得titleLabel最初的center
56     CGPoint startTitleLabelCenter = btn3.titleLabel.center;
57     
58     // 设置imageEdgeInsets
59     CGFloat imageEdgeInsetsTop = endImageViewCenter.y - startImageViewCenter.y;
60     
61     CGFloat imageEdgeInsetsLeft = endImageViewCenter.x - startImageViewCenter.x;
62     
63     CGFloat imageEdgeInsetsBottom = -imageEdgeInsetsTop;
64     
65     CGFloat imageEdgeInsetsRight = -imageEdgeInsetsLeft;
66     
67     btn3.imageEdgeInsets = UIEdgeInsetsMake(imageEdgeInsetsTop, imageEdgeInsetsLeft, imageEdgeInsetsBottom, imageEdgeInsetsRight);
68     
69     // 设置titleEdgeInsets
70     CGFloat titleEdgeInsetsTop = endTitleLabelCenter.y-startTitleLabelCenter.y;
71     
72     CGFloat titleEdgeInsetsLeft = endTitleLabelCenter.x - startTitleLabelCenter.x;
73     
74     CGFloat titleEdgeInsetsBottom = -titleEdgeInsetsTop;
75     
76     CGFloat titleEdgeInsetsRight = -titleEdgeInsetsLeft;
77     
78     btn3.titleEdgeInsets = UIEdgeInsetsMake(titleEdgeInsetsTop, titleEdgeInsetsLeft, titleEdgeInsetsBottom, titleEdgeInsetsRight);
79 }