JXLayoutButton
关于实现UIButton的上图下文、上文下图、左图右文、右图左文的布局需求，我也尝试过扩展分类使用EdgeInsets来实现，但总是不太灵活不太如意。 于是我选择了暴力解决办法：使用UIButton的子类，重写layoutSubviews。
JXLayoutButton.h
//
// JXLayoutButton.h
// JXLayoutButtonDemo
//
// Created by JiongXing on 16/9/24.
// Copyright © 2016年 JiongXing. All rights reserved.
//
#import <UIKit/UIKit.h>
typedef NS_ENUM(NSUInteger, JXLayoutButtonStyle) {
JXLayoutButtonStyleLeftImageRightTitle,
JXLayoutButtonStyleLeftTitleRightImage,
JXLayoutButtonStyleUpImageDownTitle,
JXLayoutButtonStyleUpTitleDownImage
};
/// 重写layoutSubviews的方式实现布局，忽略imageEdgeInsets、titleEdgeInsets和contentEdgeInsets
@interface JXLayoutButton : UIButton
/// 布局方式
@property (nonatomic, assign) JXLayoutButtonStyle layoutStyle;
/// 图片和文字的间距，默认值8
@property (nonatomic, assign) CGFloat midSpacing;
/// 指定图片size
@property (nonatomic, assign) CGSize imageSize;
@endJXLayoutButton.m
//
// JXLayoutButton.m
// JXLayoutButtonDemo
//
// Created by JiongXing on 16/9/24.
// Copyright © 2016年 JiongXing. All rights reserved.
//
#import "JXLayoutButton.h"
@implementation JXLayoutButton
- (instancetype)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
self.midSpacing = 8;
}
return self;
}
- (void)layoutSubviews {
[super layoutSubviews];
if (CGSizeEqualToSize(CGSizeZero, self.imageSize)) {
[self.imageView sizeToFit];
}
else {
self.imageView.frame = CGRectMake(self.imageView.frame.origin.x,
self.imageView.frame.origin.y,
self.imageSize.width,
self.imageSize.height);
}
[self.titleLabel sizeToFit];
switch (self.layoutStyle) {
case JXLayoutButtonStyleLeftImageRightTitle:
[self layoutHorizontalWithLeftView:self.imageView rightView:self.titleLabel];
break;
case JXLayoutButtonStyleLeftTitleRightImage:
[self layoutHorizontalWithLeftView:self.titleLabel rightView:self.imageView];
break;
case JXLayoutButtonStyleUpImageDownTitle:
[self layoutVerticalWithUpView:self.imageView downView:self.titleLabel];
break;
case JXLayoutButtonStyleUpTitleDownImage:
[self layoutVerticalWithUpView:self.titleLabel downView:self.imageView];
break;
default:
break;
}
}
- (void)layoutHorizontalWithLeftView:(UIView *)leftView rightView:(UIView *)rightView {
CGRect leftViewFrame = leftView.frame;
CGRect rightViewFrame = rightView.frame;
CGFloat totalWidth = CGRectGetWidth(leftViewFrame) + self.midSpacing + CGRectGetWidth(rightViewFrame);
leftViewFrame.origin.x = (CGRectGetWidth(self.frame) - totalWidth) / 2.0;
leftViewFrame.origin.y = (CGRectGetHeight(self.frame) - CGRectGetHeight(leftViewFrame)) / 2.0;
leftView.frame = leftViewFrame;
rightViewFrame.origin.x = CGRectGetMaxX(leftViewFrame) + self.midSpacing;
rightViewFrame.origin.y = (CGRectGetHeight(self.frame) - CGRectGetHeight(rightViewFrame)) / 2.0;
rightView.frame = rightViewFrame;
}
- (void)layoutVerticalWithUpView:(UIView *)upView downView:(UIView *)downView {
CGRect upViewFrame = upView.frame;
CGRect downViewFrame = downView.frame;
CGFloat totalHeight = CGRectGetHeight(upViewFrame) + self.midSpacing + CGRectGetHeight(downViewFrame);
upViewFrame.origin.y = (CGRectGetHeight(self.frame) - totalHeight) / 2.0;
upViewFrame.origin.x = (CGRectGetWidth(self.frame) - CGRectGetWidth(upViewFrame)) / 2.0;
upView.frame = upViewFrame;
downViewFrame.origin.y = CGRectGetMaxY(upViewFrame) + self.midSpacing;
downViewFrame.origin.x = (CGRectGetWidth(self.frame) - CGRectGetWidth(downViewFrame)) / 2.0;
downView.frame = downViewFrame;
}
- (void)setImage:(UIImage *)image forState:(UIControlState)state {
[super setImage:image forState:state];
[self setNeedsLayout];
}
- (void)setTitle:(NSString *)title forState:(UIControlState)state {
[super setTitle:title forState:state];
[self setNeedsLayout];
}
- (void)setMidSpacing:(CGFloat)midSpacing {
_midSpacing = midSpacing;
[self setNeedsLayout];
}
- (void)setImageSize:(CGSize)imageSize {
_imageSize = imageSize;
[self setNeedsLayout];
}
@end测试
//
// ViewController.m
// JXLayoutButtonDemo
//
// Created by JiongXing on 16/9/24.
// Copyright © 2016年 JiongXing. All rights reserved.
//
#import "ViewController.h"
#import "JXLayoutButton.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
CGFloat margin = 20;
CGFloat buttonWidth = (CGRectGetWidth(self.view.frame) - 20 * 3) / 2.0;
CGFloat buttonHeight = buttonWidth;
[self addButton: [self generateButtonWithStyle:JXLayoutButtonStyleUpImageDownTitle]
withFrame:CGRectMake(margin, 64 + margin, buttonWidth, buttonHeight)];
[self addButton: [self generateButtonWithStyle:JXLayoutButtonStyleUpTitleDownImage]
withFrame:CGRectMake(margin + buttonWidth + margin, 64 + margin, buttonWidth, buttonHeight)];
[self addButton: [self generateButtonWithStyle:JXLayoutButtonStyleLeftImageRightTitle]
withFrame:CGRectMake(margin, 64 + margin + buttonHeight + margin, buttonWidth, buttonHeight)];
[self addButton: [self generateButtonWithStyle:JXLayoutButtonStyleLeftTitleRightImage]
withFrame:CGRectMake(margin + buttonWidth + margin, 64 + margin + buttonHeight + margin, buttonWidth, buttonHeight)];
JXLayoutButton *customSizeButton = [self generateButtonWithStyle:JXLayoutButtonStyleUpImageDownTitle];
[customSizeButton setTitle:@"SmallSize" forState:UIControlStateNormal];
customSizeButton.imageSize = CGSizeMake(100 / 4, 140 / 4);
[self addButton:customSizeButton
withFrame:CGRectMake((CGRectGetWidth(self.view.frame) - buttonWidth) / 2.0, 64 + margin * 3 + buttonHeight * 2, buttonWidth, buttonHeight)];
}
- (JXLayoutButton *)generateButtonWithStyle:(JXLayoutButtonStyle)style {
JXLayoutButton *button = [JXLayoutButton buttonWithType:UIButtonTypeCustom];
[button setImage:[UIImage imageNamed:@"luffy"] forState:UIControlStateNormal];
[button setTitle:@"Luffy" forState:UIControlStateNormal];
[button setTitleColor:[UIColor darkTextColor] forState:UIControlStateNormal];
button.layoutStyle = style;
button.layer.borderWidth = 1;
button.layer.borderColor = [UIColor magentaColor].CGColor;
return button;
}
- (void)addButton:(JXLayoutButton *)button withFrame:(CGRect)frame {
button.frame = frame;
[self.view addSubview:button];
}
@end结果如上图。