.h文件的实现
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;
@end
.m的实现
@implementation JXLayoutButton
- (instancetype)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
self.midSpacing = 0;
self.imageSize = CGSizeZero;
}
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];
}
自定义按钮的在对应的文件里实现方法如下：
JXLayoutButton *returnButton = [JXLayoutButton buttonWithType:UIButtonTypeCustom];
_returnButton.layoutStyle = JXLayoutButtonStyleLeftImageRightTitle;
_returnButton.midSpacing = 0;
[_returnButton setFrame:CGRectMake(0, 20, LCDW/6, 44)];
[_returnButton setImage:[UIImage imageNamed:@"returnButton"] forState:UIControlStateNormal];
[_returnButton setTitle:@"返回" forState:UIControlStateNormal];
_returnButton.titleLabel.font = [UIFont systemFontOfSize:14];
[_returnButton addTarget:self action:@selector(returnBefore:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:_returnButton];