UIButton图片文字控件位置自定义(图片居右文字居左、图片居中文字居中、图片居左文字消失等)

在开发中常常会碰到须要对按钮中的图片文字位置作调整的需求。
第一种方式是经过设置按钮中图片文字的偏移量。经过方法setTitleEdgeInsets和setImageEdgeInsets实现算法

代码以下:布局

/*!**方式一***/
- (void)updateBtnStyle_rightImage:(UIButton *)btn {
    
    CGFloat btnImageWidth = btn.imageView.bounds.size.width;
    CGFloat btnLabelWidth = btn.titleLabel.bounds.size.width;
    CGFloat margin = 3;
    
    btnImageWidth += margin;
    btnLabelWidth += margin;
    
    [btn setTitleEdgeInsets:UIEdgeInsetsMake(0, -btnImageWidth, 0, btnImageWidth)];
    [btn setImageEdgeInsets:UIEdgeInsetsMake(0, btnLabelWidth, 0, -btnLabelWidth)];
}

这种方式对普通的需求是能够知足的,可是操做起来麻烦,不是那么直观。对于像修改图片子控件的宽高这种高度自定义的行为是很难实现的。spa

第二种方式则能够像布局子视图同样自由调整图片和文字的位置,简单方便。能够调出须要的任意布局方式。code

代码以下:blog

1.在.h文件中:继承

自定义类ZFButton,继承自UIButton。定义枚举ZFButtonType说明不一样的类型。定义实例更新方法- (void)updateButtonStyleWithType:在须要的时候,根据本身的意愿更新成本身想要的样式。图片

#import <UIKit/UIKit.h>

typedef enum : NSUInteger {
    ZFButtonTypeCenterImageCenterTitle,//图片,文字都居中
    ZFButtonTypeRightImageLeftTitle,//图片右,文字左
    ZFButtonTypeLeftImageNoneTitle,//图片左,文字无
} ZFButtonType;

@interface ZFButton : UIButton
+ (instancetype)zfButtonWithType:(ZFButtonType)buttonType;

- (void)updateButtonStyleWithType:(ZFButtonType)buttonType;
@end

2.中.m文件中:开发

重写方法- (void)layoutSubviews,根据不一样的类型生成不一样的布局。it

- (void)layoutSubviews {
    [super layoutSubviews];
    
    if (self.type == ZFButtonTypeCenterImageCenterTitle) {
        [self resetBtnCenterImageCenterTitle];
    } else if (self.type == ZFButtonTypeLeftImageNoneTitle) {
        [self resetBtnLeftImageNotTitle];
    } else if (self.type == ZFButtonTypeRightImageLeftTitle) {
        [self resetBtnRightImageLeftTitle];
    }
}

工厂方法zfButtonWithType:建立不一样类型的ZFButton。class

实例更新方法- (void)updateButtonStyleWithType:更新成不一样UI类型的Button

+ (instancetype)zfButtonWithType:(ZFButtonType)buttonType {

    ZFButton * btn = [ZFButton buttonWithType:UIButtonTypeCustom];
    btn.type = buttonType;
    
    return btn;
}

- (void)updateButtonStyleWithType:(ZFButtonType)buttonType {

    self.type = buttonType;
    [self layoutSubviews];
}

具体算法以下:

#pragma mark - 私有方法
/*!**方式二***/
- (void)resetBtnCenterImageCenterTitle {
    
    self.imageView.frame = self.bounds;
    [self.imageView setContentMode:UIViewContentModeCenter];
    
    self.titleLabel.frame = self.bounds;
    self.titleLabel.textAlignment = NSTextAlignmentCenter;
}

- (void)resetBtnLeftImageNotTitle {
    
    CGRect frame = self.bounds;
    frame.size.width *= 0.5;
    self.imageView.frame = frame;
    [self.imageView setContentMode:UIViewContentModeCenter];
    
    self.titleLabel.frame = CGRectZero;
    self.titleLabel.textAlignment = NSTextAlignmentCenter;
}

- (void)resetBtnRightImageLeftTitle {
    
    CGRect frame = self.bounds;
    frame.size.width *= 0.5;
    self.titleLabel.frame = frame;
    self.titleLabel.textAlignment = NSTextAlignmentCenter;
    
    frame.origin.x = (self.bounds.size.width - frame.size.width);
    self.imageView.frame = frame;
    [self.imageView setContentMode:UIViewContentModeCenter];
}

 

效果图和层级图展现以下:

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