iOS工程调试小技巧一：交换dealloc、字体方法，重写description

来源：互联网发布：php类与对象person 编辑：程序博客网时间：2024/05/29 23:46

很多人给工程调试时，每个界面都写dealloc，能达到效果，未免有些麻烦。下面介绍一个小小实例：

控制器写个分类，用runtime方法交换。

一、控制器、View分类

1.新建分类

#import "UIViewController+XYController.h"

2.m引入头文件

#import <objc/runtime.h>

3.实现如下两个方法

+ (void)load{

Method m1 = class_getInstanceMethod([self class], NSSelectorFromString(@

"dealloc"));

Method m2 = class_getInstanceMethod([self class], @selector(xy_dealloc));

method_exchangeImplementations(m1, m2);

}

- (void)xy_dealloc

{

NSLog(@"xy_dealloc - %@",[self class]);

[self xy_dealloc];

}

二、字体适配也可交换方法

+ (void)load

{

Method m1 = class_getClassMethod(self,@selector(systemFontOfSize:));

Method m2 = class_getClassMethod(self,@selector(MDJ_ystemFontOfSize:));

method_exchangeImplementations(m1, m2);

}

+ (void)MDJ_ystemFontOfSize:(CGFloat)fontSize

{

MDJLog(@"----");

// 以iPhone6屏幕对角线为基准，计算不同机型的比例，根据项目可以适当调整比例。

if (Iphone5){

fontSize -=1;

}elseif (Iphone6Plus){

fontSize +=1;

}

[self MDJ_ystemFontOfSize:fontSize];

}

三、给NSObject写分类，调试打印整齐，易于查看

#import "NSObject+MDJExtnestion.h"

#import <objc/message.h>

@implementation NSObject (MDJExtnestion)

#define MYTest2

#ifdef MYTest

- (NSString *)description

{

NSMutableString *descri = [NSMutableString string];

unsignedint count = 0;

objc_property_t *properties = class_copyPropertyList([self class], &count);

for (int i =0; i < count; i ++) {

objc_property_t property = properties[i];

constchar *cProperty = property_getName(property);

id ocProperty = [NSString stringWithUTF8String:cProperty];

id value = [self valueForKey:ocProperty];

[descri appendFormat:@" %@ : %@ ",ocProperty,value];

}

return descri;

}

#endif

@end

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