Every year, as soon as the new iPhone comes out, the matching of colors, the choice of shape, and the beauty and ugliness of the appearance are undoubtedly the most popular topics. The iPhone 12 is no exception. Instead of being round and square, it has changed the shape of the iPhone used in the past seven years. But for those who used iPhone 4 and 5 10 years ago, the new iPhone is more like a return to the old days. < / P > < p > in terms of modeling and technology, the first three generations of iPhones don’t have much eye-catching: they all have a wide frame, and the overall trend is round, while the difference among the three generations is only in the radian of the back cover and the materials selected. < / P > < p > among them, the back cover of the first generation iPhone selected the splicing mode of “aluminum alloy + black plastic”, while the iPhone 3G and 3GS were all wrapped with plastic on the shell, both for the convenience of network signal transmission. However, at this time, the changes brought about by the iPhone to the mobile phone industry are not related to a single design or function point. After all, at that time, the iPhone itself was a new hardware system, and people would like to talk about its graphical interface, multi touch screen, and virtual keyboard control. < / P > < p > these core elements not only establish the “external” of iPhone, but also make it significantly different from other mobile phones on the market. < / P > < p > in short, the iPhone 4 is a square shape formed by covering two transparent glass pieces on the front and rear fuselage with a metal middle frame, which is very different from the previous three generations of iPhones. < / P > < p > this “sandwich” style design direction was also one of the prototype designs of Apple’s first iPhone. But at that time, apple couldn’t plug in all the components without making sure it was beautiful, until the iPhone 4 was ripe. < / P > < p > in the later era of iPhone 5, the overall style of iPhone 4 still continues. However, the thickness and weight of the body have been significantly reduced due to the fact that its shell is made of a whole piece of aluminum alloy. < / P > < p > however, in order to avoid the signal being shielded by the metal layer, the upper and lower sections of the back cover of the iPhone 5 and 5S are hollowed out and replaced with a glass cover, forming a three-stage style. < / P > < p > the colorful iPhone 5C also appeared at this time. This is the first time Apple has used polycarbonate to create a color iPhone. < / P > < p > because the plastic shell is easier to receive signals than metal, the iPhone 5C does not need to have additional holes on the shell, and there are no bonding marks between the frame and the back cover, achieving a higher integrity and roundness than the iPhone 4 and 5. In addition, the iPhone 5C also changed people’s prejudice against plastic mobile phones at that time. Even if it chooses polycarbonate with lower cost, Apple’s exquisite craftsmanship makes it as smooth and bright as ceramics. < p > < p > unfortunately, there are also a lot of controversies about the iPhone at this stage. For example, the “antenna door” of the iPhone 4, the hand piercing chamfer of the iPhone 5, and the anodized aluminum back cover that will drop paint, etc. These are the problems exposed in the structure and materials of iPhone. However, in any case, Apple’s attempt to square the body is still very successful, and has left a lot of valuable design experience for subsequent iPhones. In 2008, Jonathan Ivey, the former chief designer of apple, introduced the production process of MacBook Air at an event. In the air, apple adopts a new processing method: its main frame is made of a whole metal block which is slowly cut and drilled, and the aluminum alloy shell is formed from this. < p > < p > after the successful water test on MacBook, this “one-piece” process has been gradually applied to other Apple products such as iPhone and iPad. For example, in the iPhone 5 era, its metal shell was also made by a series of milling and grinding. < / P > < p > but at this stage, apple still needs to rely on glass to complete the back cover splicing, and when different materials are combined together, it will inevitably leave traces of bonding. < / P > < p > as you can see from the side view, the square structure of the iPhone 4 and 5 era has disappeared, replaced by a fully rounded side and a slightly curved 2.5D screen glass. < / P > < p > this is also the second design change in the development of iPhone. Forward and backward, you can see two different styles of iPhone. < / P > < p > but with the one-piece metal case, new design issues arise for the iPhone 6. In order to consider the antenna signal, Apple has to cut out four plastic strips on the metal back cover. These “white strips” have a greater visual impact than the original “metal + glass” three-part structure.

also make complaints about iPhone 6 deep air ash and white version Tucao less, because the color of these two styles will be closer to the original matching color of the back cover, but not as sudden as gold and rose gold. < / P > < p > for one thing, apple reduced the number of antennas, and made the “white belt” fit the upper and lower edges of the fuselage as much as possible. At the same time, it re enabled dark black to further mask the visual impact of the antenna strips. < p > < p > secondly, apple in the iPhone 7 era also produced a brand-new “bright black” version, which is also a “dazzling technology” of apple in technology. < p > < p > Apple once explained the principle of bright black production in a craft video. It first polished the aluminum metal, followed by anodizing and dyeing processes, and finally used magnetized iron powder to soak the surface, so as to polish the metal into a glass like texture. < / P > < p > the higher production difficulty makes the bright black version obtain the texture of handicraft, and it also eliminates the difference between the injection antenna and aluminum alloy, realizing a very high integrated form. < / P > < p > but there is a price to go to the extreme – the cost is obviously on the one hand, and the bright black is very scratch resistant, and a little friction will leave traces on the fuselage. Therefore, it is doomed to fail to become a product that goes to the public. < / P > < p > the iPhone x, which is defined as the 10th anniversary of the iPhone, is still round in shape. If you just look at the side view, you don’t think it’s different from the iPhone 6 or 7. < / P > < p > with the arrival of the full screen design, the iconic element of the iPhone, the home key, was replaced by a sliding gesture, and the upper and lower ends of the screen were further extended to keep the width of the border. < / P > < p > in order to cater to the full screen shape, Apple has also completed a series of design changes at this stage. For example, after the home key disappears, functions like apple pay and calling Siri have to be completed by double clicking and long pressing the lock screen key. < / P > < p > there is also the introduction of wireless charging function, which makes iPhone abandon the design of metal integration, and choose the shape of “metal middle frame + glass back cover” similar to the iPhone 4 era. < / P > < p > so far, the eye-catching antenna strips have been completely eliminated, the back cover has returned to solid color, and the iPhone 8 series has become the design end point of the non full screen version of the iPhone. < / P > < p > the problem is still that problem. When the material used for the back cover and middle frame of the fuselage is different, the assembly trace will appear again. At this time, apple can do its best to erase this difference. There was actually an attempt in the iPhone 11 era. At that time, apple adopted a new back cover technology, which directly opened holes on a whole piece of glass, and polished the convex area of the camera, which was equivalent to two textures of frosting and bright surface on a piece of glass, so as to solve the joint gap between the convex camera and the glass back cover. < / P > < p > shortly after the iPhone 12 was released, there has been a lot of discussion about design. Right angled frames, plain glass, these are the changes you can feel when you first start. < / P > < p > but in my opinion, the more important significance of the iPhone 12 is that apple is willing to do a “simple” process on the iPhone. < / P > < p > the first is the border area. If you compare the iPhone 11, you will find that when we look at the iPhone 12 screen, we will no longer see the “convex” metal frame around the periphery. < / P > < p > this is also one of the benefits of right angle border, which can make the proportion of the screen display area under the positive vision become larger, so as to further enhance our impression. < / P > < p > other details on the iPhone 12 have been simplified as much as possible. With the development of cutting technology, apple no longer needs to use a circle of trimming to make the transition between the middle frame and the iPhone 5. In addition, the anti drop performance of the front and rear glass also makes the plastic buffer ring between the screen and the middle frame disappear. < / P > < p > that’s why the iPhone 12 looks more compact and integrated. You will no longer see the specular highlights caused by the curved surface structure; there will be no redundant decorative elements at the junction of metal and glass, and the lines are extremely simple. < / P > < p > in the end, only one screen will be left on the front of the iPhone, and the distance from the middle frame will be shortened as much as possible. This is also the ultimate form that iPhone pursues in the era of full screen. < / P > < p > in a specific period of time, there will be different interpretations of the optimal solution form of iPhone. However, from the development history, we can see that the cycle of this transformation is about 3-4 years. After each cycle starts, Apple will make a major adjustment to the iPhone, inject new design language, and reuse some elements of the previous generation. < / P > < p > perhaps for apple, maintaining such a pace of change is to match the average phone change cycle of iPhone users and the transformation nodes of the network environment; on the other hand, it also gives apple time to turn the new technology into a function that everyone is willing to use, rather than superficial and formal. < p > < p > more than a decade later, the trend of iPhone is becoming clearer and clearer. The choice of bangs, buttons and interfaces still attract people’s attention. Every update of iPhone in the future is still a challenge to break through ourselves, or maybe another round of yesterday’s reappearance. The report shows that the number of app store purchases soared in the first half of this year due to the impact of covid-19