UIButton图片文字位置的四种情况
我们在做项目的过程中经常会遇到各定制UIButton
1.左边图片,右边文字
2.左边文字,右边图片
3.上边图片,下边文字
4.上边文字,下边图片
针对这四种情况
使用UIButton的category实现
.h文件实现内容
#import <UIKit/UIKit.h> typedef NS_ENUM(NSInteger,SDButtonStyle) { SDButtonStyleNormal = 0, SDButtonStyleTitleLeft, SDButtonStyleTitleUp, SDButtonStyleTitleDown }; @interface UIButton (ButtonStyle) @property (nonatomic, assign) CGRect imageRect; @property (nonatomic, assign) CGRect titleRect; @property (nonatomic, assign) SDButtonStyle buttonStyle; @property (nonatomic, assign) CGFloat verSpace; @end
.m文件实现内容
#import "UIButton+ButtonStyle.h" #import <objc/runtime.h> @implementation UIButton (ButtonStyle) + (void)load { Method imageOriginalMethod = class_getInstanceMethod([self class], @selector(imageRectForContentRect:)); Method imageSwizzledMethod = class_getInstanceMethod([self class], @selector(sd_imageRectForContentRect:)); method_exchangeImplementations(imageOriginalMethod, imageSwizzledMethod); Method titleOriginalMethod = class_getInstanceMethod([self class], @selector(titleRectForContentRect:)); Method titleSwizzledMethod = class_getInstanceMethod([self class], @selector(sd_titleRectForContentRect:)); method_exchangeImplementations(titleOriginalMethod, titleSwizzledMethod); } - (CGRect)sd_imageRectForContentRect:(CGRect)contentRect { if (!CGRectIsEmpty(self.imageRect) && !CGRectEqualToRect(self.imageRect, CGRectZero)) { return self.imageRect; } CGRect imgRect = [self sd_imageRectForContentRect:contentRect]; CGRect titRect = [self sd_titleRectForContentRect:contentRect]; if (self.buttonStyle == SDButtonStyleTitleLeft) { imgRect.origin.x = CGRectGetMaxX(titRect) - CGRectGetWidth(imgRect); return imgRect; } if (self.buttonStyle == SDButtonStyleTitleDown) { imgRect.origin.x = (CGRectGetWidth(contentRect) - CGRectGetWidth(imgRect))/2.f; imgRect.origin.y = ceilf((CGRectGetHeight(contentRect) - CGRectGetHeight(titRect) - CGRectGetHeight(imgRect))) /2.f; return imgRect; } if (self.buttonStyle == SDButtonStyleTitleUp) { imgRect.origin.x = (CGRectGetWidth(contentRect) - CGRectGetWidth(imgRect))/2.f; imgRect.origin.y = (CGRectGetHeight(contentRect) + CGRectGetHeight(titRect) - CGRectGetHeight(imgRect) + self.verSpace)/2.f; return imgRect; } return imgRect; } - (CGRect)sd_titleRectForContentRect:(CGRect)contentRect { if (!CGRectIsEmpty(self.titleRect) && !CGRectEqualToRect(self.titleRect, CGRectZero)) { return self.titleRect; } CGRect imgRect = [self sd_imageRectForContentRect:contentRect]; CGRect titRect = CGRectZero; if (self.buttonStyle == SDButtonStyleTitleLeft) { titRect = [self sd_titleRectForContentRect:contentRect]; titRect.origin.x = CGRectGetMinX(imgRect) - self.verSpace; return titRect; } CGFloat height = CGRectGetHeight(contentRect); CGFloat width = CGRectGetWidth(contentRect); if (self.buttonStyle == SDButtonStyleTitleDown) { titRect = [self sd_titleRectForContentRect:CGRectMake(0, 0, 3 * width, height)]; titRect.origin.x = ceilf((width - CGRectGetWidth(titRect))/2.f); titRect.origin.y = ceilf((height - CGRectGetHeight(titRect) + CGRectGetHeight(imgRect))/2.f + self.verSpace); return titRect; } if (self.buttonStyle == SDButtonStyleTitleUp) { titRect = [self sd_titleRectForContentRect:CGRectMake(0, 0, 3 * width, height)]; titRect.origin.x = ceilf((width - CGRectGetWidth(titRect))/2.f); titRect.origin.y = ceilf((height - CGRectGetHeight(titRect) - CGRectGetHeight(imgRect) - self.verSpace ) /2.f); return titRect; } return [self sd_titleRectForContentRect:contentRect]; } #pragma mark --- AssociatedObject - (void)setImageRect:(CGRect)imageRect { NSValue *value = [NSValue valueWithCGRect:imageRect]; objc_setAssociatedObject(self, @selector(imageRect), value, OBJC_ASSOCIATION_RETAIN_NONATOMIC); } - (CGRect)imageRect { NSValue *value = objc_getAssociatedObject(self, @selector(imageRect)); return [value CGRectValue]; } - (void)setTitleRect:(CGRect)titleRect { NSValue *value = [NSValue valueWithCGRect:titleRect]; objc_setAssociatedObject(self, @selector(titleRect), value, OBJC_ASSOCIATION_RETAIN_NONATOMIC); } - (CGRect)titleRect { NSValue *value = objc_getAssociatedObject(self, @selector(titleRect)); return [value CGRectValue]; } - (CGFloat)verSpace { NSNumber *value = objc_getAssociatedObject(self, @selector(verSpace)); return [value floatValue]; } - (void)setVerSpace:(CGFloat)verSpace { NSNumber *value = [NSNumber numberWithFloat:verSpace]; objc_setAssociatedObject(self, @selector(verSpace), value, OBJC_ASSOCIATION_RETAIN_NONATOMIC); } - (void)setButtonStyle:(SDButtonStyle)buttonStyle { objc_setAssociatedObject(self, @selector(buttonStyle), @(buttonStyle), OBJC_ASSOCIATION_ASSIGN); } - (SDButtonStyle)buttonStyle { return [objc_getAssociatedObject(self, @selector(buttonStyle)) integerValue]; } @end